diff --git a/.changeset/wild-coins-worry.md b/.changeset/wild-coins-worry.md
new file mode 100644
index 000000000..ab7f3b344
--- /dev/null
+++ b/.changeset/wild-coins-worry.md
@@ -0,0 +1,5 @@
+---
+"braintrust": patch
+---
+
+fix(google-genai): Capture multi-turn message APIs with wrapper
diff --git a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1300.log-payloads.json b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1300.log-payloads.json
index b94227f03..1b803a8a2 100644
--- a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1300.log-payloads.json
+++ b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1300.log-payloads.json
@@ -124,6 +124,165 @@
     },
     "type": "llm"
   },
+  {
+    "metadata": {
+      "operation": "chat"
+    },
+    "metrics": {
+      "end": 0,
+      "start": 0
+    },
+    "name": "google-chat-operation",
+    "type": null
+  },
+  {
+    "input": {
+      "config": {
+        "maxOutputTokens": 24,
+        "temperature": 0
+      },
+      "contents": [
+        {
+          "parts": [
+            {
+              "text": "Reply with exactly MADRID."
+            }
+          ],
+          "role": "user"
+        }
+      ],
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metrics": {
+      "completion_tokens": "<number>",
+      "duration": 0,
+      "end": 0,
+      "prompt_tokens": "<number>",
+      "start": 0,
+      "tokens": "<number>"
+    },
+    "name": "generate_content",
+    "output": {
+      "candidates": [
+        {
+          "content": {
+            "parts": [
+              {
+                "text": "MADRID"
+              }
+            ],
+            "role": "model"
+          },
+          "finishReason": "STOP",
+          "index": 0
+        }
+      ],
+      "modelVersion": "gemini-2.5-flash-lite",
+      "responseId": "<responseId:2>",
+      "sdkHttpResponse": {
+        "headers": {
+          "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
+          "content-encoding": "gzip",
+          "content-type": "application/json; charset=UTF-8",
+          "date": "<timestamp>",
+          "server": "scaffolding on HTTPServer2",
+          "server-timing": "<server-timing>",
+          "transfer-encoding": "chunked",
+          "vary": "Origin, X-Origin, Referer",
+          "x-content-type-options": "nosniff",
+          "x-frame-options": "SAMEORIGIN",
+          "x-gemini-service-tier": "<x-gemini-service-tier>",
+          "x-xss-protection": "0"
+        }
+      },
+      "usageMetadata": {
+        "candidatesTokenCount": "<number>",
+        "promptTokenCount": "<number>",
+        "promptTokensDetails": [
+          {
+            "modality": "TEXT",
+            "tokenCount": "<number>"
+          }
+        ],
+        "totalTokenCount": "<number>"
+      }
+    },
+    "type": "llm"
+  },
+  {
+    "metadata": {
+      "operation": "chat-stream"
+    },
+    "metrics": {
+      "end": 0,
+      "start": 0
+    },
+    "name": "google-chat-stream-operation",
+    "type": null
+  },
+  {
+    "input": {
+      "config": {
+        "maxOutputTokens": 64,
+        "temperature": 0
+      },
+      "contents": [
+        {
+          "parts": [
+            {
+              "text": "Count from 1 to 3 and include the words one two three."
+            }
+          ],
+          "role": "user"
+        }
+      ],
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metrics": {
+      "completion_tokens": "<number>",
+      "duration": 0,
+      "end": 0,
+      "prompt_tokens": "<number>",
+      "start": 0,
+      "time_to_first_token": 0,
+      "tokens": "<number>"
+    },
+    "name": "generate_content_stream",
+    "output": {
+      "candidates": [
+        {
+          "content": {
+            "parts": [
+              {
+                "text": "Here's the count from 1 to 3, including the words:\n\n1. One\n2. Two\n3. Three"
+              }
+            ],
+            "role": "model"
+          },
+          "finishReason": "STOP"
+        }
+      ],
+      "text": "Here's the count from 1 to 3, including the words:\n\n1. One\n2. Two\n3. Three",
+      "usageMetadata": {
+        "candidatesTokenCount": "<number>",
+        "promptTokenCount": "<number>",
+        "promptTokensDetails": [
+          {
+            "modality": "TEXT",
+            "tokenCount": "<number>"
+          }
+        ],
+        "totalTokenCount": "<number>"
+      }
+    },
+    "type": "llm"
+  },
   {
     "metadata": {
       "operation": "attachment"
@@ -149,7 +308,7 @@
                 "url": {
                   "content_type": "image/png",
                   "filename": "file.png",
-                  "key": "<uuid:2>",
+                  "key": "<uuid:3>",
                   "type": "braintrust_attachment"
                 }
               }
@@ -191,7 +350,7 @@
         }
       ],
       "modelVersion": "gemini-2.5-flash-lite",
-      "responseId": "<responseId:2>",
+      "responseId": "<responseId:3>",
       "sdkHttpResponse": {
         "headers": {
           "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
@@ -417,7 +576,7 @@
         }
       ],
       "modelVersion": "gemini-2.5-flash-lite",
-      "responseId": "<responseId:3>",
+      "responseId": "<responseId:4>",
       "sdkHttpResponse": {
         "headers": {
           "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
diff --git a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1300.span-events.json b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1300.span-events.json
index 6c19af05e..6c7326660 100644
--- a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1300.span-events.json
+++ b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1300.span-events.json
@@ -83,10 +83,10 @@
     "has_input": false,
     "has_output": false,
     "metadata": {
-      "operation": "attachment"
+      "operation": "chat"
     },
     "metric_keys": [],
-    "name": "google-attachment-operation",
+    "name": "google-chat-operation",
     "root_span_id": "<span:1>",
     "span_id": "<span:6>",
     "span_parents": [
@@ -118,10 +118,10 @@
     "has_input": false,
     "has_output": false,
     "metadata": {
-      "operation": "stream"
+      "operation": "chat-stream"
     },
     "metric_keys": [],
-    "name": "google-stream-operation",
+    "name": "google-chat-stream-operation",
     "root_span_id": "<span:1>",
     "span_id": "<span:8>",
     "span_parents": [
@@ -150,6 +150,77 @@
     ],
     "type": "llm"
   },
+  {
+    "has_input": false,
+    "has_output": false,
+    "metadata": {
+      "operation": "attachment"
+    },
+    "metric_keys": [],
+    "name": "google-attachment-operation",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:10>",
+    "span_parents": [
+      "<span:1>"
+    ],
+    "type": null
+  },
+  {
+    "has_input": true,
+    "has_output": true,
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metric_keys": [
+      "completion_tokens",
+      "duration",
+      "prompt_tokens",
+      "tokens"
+    ],
+    "name": "generate_content",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:11>",
+    "span_parents": [
+      "<span:10>"
+    ],
+    "type": "llm"
+  },
+  {
+    "has_input": false,
+    "has_output": false,
+    "metadata": {
+      "operation": "stream"
+    },
+    "metric_keys": [],
+    "name": "google-stream-operation",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:12>",
+    "span_parents": [
+      "<span:1>"
+    ],
+    "type": null
+  },
+  {
+    "has_input": true,
+    "has_output": true,
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metric_keys": [
+      "completion_tokens",
+      "duration",
+      "prompt_tokens",
+      "time_to_first_token",
+      "tokens"
+    ],
+    "name": "generate_content_stream",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:13>",
+    "span_parents": [
+      "<span:12>"
+    ],
+    "type": "llm"
+  },
   {
     "has_input": false,
     "has_output": false,
@@ -159,7 +230,7 @@
     "metric_keys": [],
     "name": "google-stream-return-operation",
     "root_span_id": "<span:1>",
-    "span_id": "<span:10>",
+    "span_id": "<span:14>",
     "span_parents": [
       "<span:1>"
     ],
@@ -180,9 +251,9 @@
     ],
     "name": "generate_content_stream",
     "root_span_id": "<span:1>",
-    "span_id": "<span:11>",
+    "span_id": "<span:15>",
     "span_parents": [
-      "<span:10>"
+      "<span:14>"
     ],
     "type": "llm"
   },
@@ -195,7 +266,7 @@
     "metric_keys": [],
     "name": "google-tool-operation",
     "root_span_id": "<span:1>",
-    "span_id": "<span:12>",
+    "span_id": "<span:16>",
     "span_parents": [
       "<span:1>"
     ],
@@ -215,9 +286,9 @@
     ],
     "name": "generate_content",
     "root_span_id": "<span:1>",
-    "span_id": "<span:13>",
+    "span_id": "<span:17>",
     "span_parents": [
-      "<span:12>"
+      "<span:16>"
     ],
     "type": "llm"
   }
diff --git a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1440.log-payloads.json b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1440.log-payloads.json
index b94227f03..1b803a8a2 100644
--- a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1440.log-payloads.json
+++ b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1440.log-payloads.json
@@ -124,6 +124,165 @@
     },
     "type": "llm"
   },
+  {
+    "metadata": {
+      "operation": "chat"
+    },
+    "metrics": {
+      "end": 0,
+      "start": 0
+    },
+    "name": "google-chat-operation",
+    "type": null
+  },
+  {
+    "input": {
+      "config": {
+        "maxOutputTokens": 24,
+        "temperature": 0
+      },
+      "contents": [
+        {
+          "parts": [
+            {
+              "text": "Reply with exactly MADRID."
+            }
+          ],
+          "role": "user"
+        }
+      ],
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metrics": {
+      "completion_tokens": "<number>",
+      "duration": 0,
+      "end": 0,
+      "prompt_tokens": "<number>",
+      "start": 0,
+      "tokens": "<number>"
+    },
+    "name": "generate_content",
+    "output": {
+      "candidates": [
+        {
+          "content": {
+            "parts": [
+              {
+                "text": "MADRID"
+              }
+            ],
+            "role": "model"
+          },
+          "finishReason": "STOP",
+          "index": 0
+        }
+      ],
+      "modelVersion": "gemini-2.5-flash-lite",
+      "responseId": "<responseId:2>",
+      "sdkHttpResponse": {
+        "headers": {
+          "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
+          "content-encoding": "gzip",
+          "content-type": "application/json; charset=UTF-8",
+          "date": "<timestamp>",
+          "server": "scaffolding on HTTPServer2",
+          "server-timing": "<server-timing>",
+          "transfer-encoding": "chunked",
+          "vary": "Origin, X-Origin, Referer",
+          "x-content-type-options": "nosniff",
+          "x-frame-options": "SAMEORIGIN",
+          "x-gemini-service-tier": "<x-gemini-service-tier>",
+          "x-xss-protection": "0"
+        }
+      },
+      "usageMetadata": {
+        "candidatesTokenCount": "<number>",
+        "promptTokenCount": "<number>",
+        "promptTokensDetails": [
+          {
+            "modality": "TEXT",
+            "tokenCount": "<number>"
+          }
+        ],
+        "totalTokenCount": "<number>"
+      }
+    },
+    "type": "llm"
+  },
+  {
+    "metadata": {
+      "operation": "chat-stream"
+    },
+    "metrics": {
+      "end": 0,
+      "start": 0
+    },
+    "name": "google-chat-stream-operation",
+    "type": null
+  },
+  {
+    "input": {
+      "config": {
+        "maxOutputTokens": 64,
+        "temperature": 0
+      },
+      "contents": [
+        {
+          "parts": [
+            {
+              "text": "Count from 1 to 3 and include the words one two three."
+            }
+          ],
+          "role": "user"
+        }
+      ],
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metrics": {
+      "completion_tokens": "<number>",
+      "duration": 0,
+      "end": 0,
+      "prompt_tokens": "<number>",
+      "start": 0,
+      "time_to_first_token": 0,
+      "tokens": "<number>"
+    },
+    "name": "generate_content_stream",
+    "output": {
+      "candidates": [
+        {
+          "content": {
+            "parts": [
+              {
+                "text": "Here's the count from 1 to 3, including the words:\n\n1. One\n2. Two\n3. Three"
+              }
+            ],
+            "role": "model"
+          },
+          "finishReason": "STOP"
+        }
+      ],
+      "text": "Here's the count from 1 to 3, including the words:\n\n1. One\n2. Two\n3. Three",
+      "usageMetadata": {
+        "candidatesTokenCount": "<number>",
+        "promptTokenCount": "<number>",
+        "promptTokensDetails": [
+          {
+            "modality": "TEXT",
+            "tokenCount": "<number>"
+          }
+        ],
+        "totalTokenCount": "<number>"
+      }
+    },
+    "type": "llm"
+  },
   {
     "metadata": {
       "operation": "attachment"
@@ -149,7 +308,7 @@
                 "url": {
                   "content_type": "image/png",
                   "filename": "file.png",
-                  "key": "<uuid:2>",
+                  "key": "<uuid:3>",
                   "type": "braintrust_attachment"
                 }
               }
@@ -191,7 +350,7 @@
         }
       ],
       "modelVersion": "gemini-2.5-flash-lite",
-      "responseId": "<responseId:2>",
+      "responseId": "<responseId:3>",
       "sdkHttpResponse": {
         "headers": {
           "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
@@ -417,7 +576,7 @@
         }
       ],
       "modelVersion": "gemini-2.5-flash-lite",
-      "responseId": "<responseId:3>",
+      "responseId": "<responseId:4>",
       "sdkHttpResponse": {
         "headers": {
           "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
diff --git a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1440.span-events.json b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1440.span-events.json
index 6c19af05e..6c7326660 100644
--- a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1440.span-events.json
+++ b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1440.span-events.json
@@ -83,10 +83,10 @@
     "has_input": false,
     "has_output": false,
     "metadata": {
-      "operation": "attachment"
+      "operation": "chat"
     },
     "metric_keys": [],
-    "name": "google-attachment-operation",
+    "name": "google-chat-operation",
     "root_span_id": "<span:1>",
     "span_id": "<span:6>",
     "span_parents": [
@@ -118,10 +118,10 @@
     "has_input": false,
     "has_output": false,
     "metadata": {
-      "operation": "stream"
+      "operation": "chat-stream"
     },
     "metric_keys": [],
-    "name": "google-stream-operation",
+    "name": "google-chat-stream-operation",
     "root_span_id": "<span:1>",
     "span_id": "<span:8>",
     "span_parents": [
@@ -150,6 +150,77 @@
     ],
     "type": "llm"
   },
+  {
+    "has_input": false,
+    "has_output": false,
+    "metadata": {
+      "operation": "attachment"
+    },
+    "metric_keys": [],
+    "name": "google-attachment-operation",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:10>",
+    "span_parents": [
+      "<span:1>"
+    ],
+    "type": null
+  },
+  {
+    "has_input": true,
+    "has_output": true,
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metric_keys": [
+      "completion_tokens",
+      "duration",
+      "prompt_tokens",
+      "tokens"
+    ],
+    "name": "generate_content",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:11>",
+    "span_parents": [
+      "<span:10>"
+    ],
+    "type": "llm"
+  },
+  {
+    "has_input": false,
+    "has_output": false,
+    "metadata": {
+      "operation": "stream"
+    },
+    "metric_keys": [],
+    "name": "google-stream-operation",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:12>",
+    "span_parents": [
+      "<span:1>"
+    ],
+    "type": null
+  },
+  {
+    "has_input": true,
+    "has_output": true,
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metric_keys": [
+      "completion_tokens",
+      "duration",
+      "prompt_tokens",
+      "time_to_first_token",
+      "tokens"
+    ],
+    "name": "generate_content_stream",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:13>",
+    "span_parents": [
+      "<span:12>"
+    ],
+    "type": "llm"
+  },
   {
     "has_input": false,
     "has_output": false,
@@ -159,7 +230,7 @@
     "metric_keys": [],
     "name": "google-stream-return-operation",
     "root_span_id": "<span:1>",
-    "span_id": "<span:10>",
+    "span_id": "<span:14>",
     "span_parents": [
       "<span:1>"
     ],
@@ -180,9 +251,9 @@
     ],
     "name": "generate_content_stream",
     "root_span_id": "<span:1>",
-    "span_id": "<span:11>",
+    "span_id": "<span:15>",
     "span_parents": [
-      "<span:10>"
+      "<span:14>"
     ],
     "type": "llm"
   },
@@ -195,7 +266,7 @@
     "metric_keys": [],
     "name": "google-tool-operation",
     "root_span_id": "<span:1>",
-    "span_id": "<span:12>",
+    "span_id": "<span:16>",
     "span_parents": [
       "<span:1>"
     ],
@@ -215,9 +286,9 @@
     ],
     "name": "generate_content",
     "root_span_id": "<span:1>",
-    "span_id": "<span:13>",
+    "span_id": "<span:17>",
     "span_parents": [
-      "<span:12>"
+      "<span:16>"
     ],
     "type": "llm"
   }
diff --git a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1450.log-payloads.json b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1450.log-payloads.json
index b94227f03..1b803a8a2 100644
--- a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1450.log-payloads.json
+++ b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1450.log-payloads.json
@@ -124,6 +124,165 @@
     },
     "type": "llm"
   },
+  {
+    "metadata": {
+      "operation": "chat"
+    },
+    "metrics": {
+      "end": 0,
+      "start": 0
+    },
+    "name": "google-chat-operation",
+    "type": null
+  },
+  {
+    "input": {
+      "config": {
+        "maxOutputTokens": 24,
+        "temperature": 0
+      },
+      "contents": [
+        {
+          "parts": [
+            {
+              "text": "Reply with exactly MADRID."
+            }
+          ],
+          "role": "user"
+        }
+      ],
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metrics": {
+      "completion_tokens": "<number>",
+      "duration": 0,
+      "end": 0,
+      "prompt_tokens": "<number>",
+      "start": 0,
+      "tokens": "<number>"
+    },
+    "name": "generate_content",
+    "output": {
+      "candidates": [
+        {
+          "content": {
+            "parts": [
+              {
+                "text": "MADRID"
+              }
+            ],
+            "role": "model"
+          },
+          "finishReason": "STOP",
+          "index": 0
+        }
+      ],
+      "modelVersion": "gemini-2.5-flash-lite",
+      "responseId": "<responseId:2>",
+      "sdkHttpResponse": {
+        "headers": {
+          "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
+          "content-encoding": "gzip",
+          "content-type": "application/json; charset=UTF-8",
+          "date": "<timestamp>",
+          "server": "scaffolding on HTTPServer2",
+          "server-timing": "<server-timing>",
+          "transfer-encoding": "chunked",
+          "vary": "Origin, X-Origin, Referer",
+          "x-content-type-options": "nosniff",
+          "x-frame-options": "SAMEORIGIN",
+          "x-gemini-service-tier": "<x-gemini-service-tier>",
+          "x-xss-protection": "0"
+        }
+      },
+      "usageMetadata": {
+        "candidatesTokenCount": "<number>",
+        "promptTokenCount": "<number>",
+        "promptTokensDetails": [
+          {
+            "modality": "TEXT",
+            "tokenCount": "<number>"
+          }
+        ],
+        "totalTokenCount": "<number>"
+      }
+    },
+    "type": "llm"
+  },
+  {
+    "metadata": {
+      "operation": "chat-stream"
+    },
+    "metrics": {
+      "end": 0,
+      "start": 0
+    },
+    "name": "google-chat-stream-operation",
+    "type": null
+  },
+  {
+    "input": {
+      "config": {
+        "maxOutputTokens": 64,
+        "temperature": 0
+      },
+      "contents": [
+        {
+          "parts": [
+            {
+              "text": "Count from 1 to 3 and include the words one two three."
+            }
+          ],
+          "role": "user"
+        }
+      ],
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metrics": {
+      "completion_tokens": "<number>",
+      "duration": 0,
+      "end": 0,
+      "prompt_tokens": "<number>",
+      "start": 0,
+      "time_to_first_token": 0,
+      "tokens": "<number>"
+    },
+    "name": "generate_content_stream",
+    "output": {
+      "candidates": [
+        {
+          "content": {
+            "parts": [
+              {
+                "text": "Here's the count from 1 to 3, including the words:\n\n1. One\n2. Two\n3. Three"
+              }
+            ],
+            "role": "model"
+          },
+          "finishReason": "STOP"
+        }
+      ],
+      "text": "Here's the count from 1 to 3, including the words:\n\n1. One\n2. Two\n3. Three",
+      "usageMetadata": {
+        "candidatesTokenCount": "<number>",
+        "promptTokenCount": "<number>",
+        "promptTokensDetails": [
+          {
+            "modality": "TEXT",
+            "tokenCount": "<number>"
+          }
+        ],
+        "totalTokenCount": "<number>"
+      }
+    },
+    "type": "llm"
+  },
   {
     "metadata": {
       "operation": "attachment"
@@ -149,7 +308,7 @@
                 "url": {
                   "content_type": "image/png",
                   "filename": "file.png",
-                  "key": "<uuid:2>",
+                  "key": "<uuid:3>",
                   "type": "braintrust_attachment"
                 }
               }
@@ -191,7 +350,7 @@
         }
       ],
       "modelVersion": "gemini-2.5-flash-lite",
-      "responseId": "<responseId:2>",
+      "responseId": "<responseId:3>",
       "sdkHttpResponse": {
         "headers": {
           "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
@@ -417,7 +576,7 @@
         }
       ],
       "modelVersion": "gemini-2.5-flash-lite",
-      "responseId": "<responseId:3>",
+      "responseId": "<responseId:4>",
       "sdkHttpResponse": {
         "headers": {
           "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
diff --git a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1450.span-events.json b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1450.span-events.json
index 6c19af05e..6c7326660 100644
--- a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1450.span-events.json
+++ b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1450.span-events.json
@@ -83,10 +83,10 @@
     "has_input": false,
     "has_output": false,
     "metadata": {
-      "operation": "attachment"
+      "operation": "chat"
     },
     "metric_keys": [],
-    "name": "google-attachment-operation",
+    "name": "google-chat-operation",
     "root_span_id": "<span:1>",
     "span_id": "<span:6>",
     "span_parents": [
@@ -118,10 +118,10 @@
     "has_input": false,
     "has_output": false,
     "metadata": {
-      "operation": "stream"
+      "operation": "chat-stream"
     },
     "metric_keys": [],
-    "name": "google-stream-operation",
+    "name": "google-chat-stream-operation",
     "root_span_id": "<span:1>",
     "span_id": "<span:8>",
     "span_parents": [
@@ -150,6 +150,77 @@
     ],
     "type": "llm"
   },
+  {
+    "has_input": false,
+    "has_output": false,
+    "metadata": {
+      "operation": "attachment"
+    },
+    "metric_keys": [],
+    "name": "google-attachment-operation",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:10>",
+    "span_parents": [
+      "<span:1>"
+    ],
+    "type": null
+  },
+  {
+    "has_input": true,
+    "has_output": true,
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metric_keys": [
+      "completion_tokens",
+      "duration",
+      "prompt_tokens",
+      "tokens"
+    ],
+    "name": "generate_content",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:11>",
+    "span_parents": [
+      "<span:10>"
+    ],
+    "type": "llm"
+  },
+  {
+    "has_input": false,
+    "has_output": false,
+    "metadata": {
+      "operation": "stream"
+    },
+    "metric_keys": [],
+    "name": "google-stream-operation",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:12>",
+    "span_parents": [
+      "<span:1>"
+    ],
+    "type": null
+  },
+  {
+    "has_input": true,
+    "has_output": true,
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metric_keys": [
+      "completion_tokens",
+      "duration",
+      "prompt_tokens",
+      "time_to_first_token",
+      "tokens"
+    ],
+    "name": "generate_content_stream",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:13>",
+    "span_parents": [
+      "<span:12>"
+    ],
+    "type": "llm"
+  },
   {
     "has_input": false,
     "has_output": false,
@@ -159,7 +230,7 @@
     "metric_keys": [],
     "name": "google-stream-return-operation",
     "root_span_id": "<span:1>",
-    "span_id": "<span:10>",
+    "span_id": "<span:14>",
     "span_parents": [
       "<span:1>"
     ],
@@ -180,9 +251,9 @@
     ],
     "name": "generate_content_stream",
     "root_span_id": "<span:1>",
-    "span_id": "<span:11>",
+    "span_id": "<span:15>",
     "span_parents": [
-      "<span:10>"
+      "<span:14>"
     ],
     "type": "llm"
   },
@@ -195,7 +266,7 @@
     "metric_keys": [],
     "name": "google-tool-operation",
     "root_span_id": "<span:1>",
-    "span_id": "<span:12>",
+    "span_id": "<span:16>",
     "span_parents": [
       "<span:1>"
     ],
@@ -215,9 +286,9 @@
     ],
     "name": "generate_content",
     "root_span_id": "<span:1>",
-    "span_id": "<span:13>",
+    "span_id": "<span:17>",
     "span_parents": [
-      "<span:12>"
+      "<span:16>"
     ],
     "type": "llm"
   }
diff --git a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1460.log-payloads.json b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1460.log-payloads.json
index b94227f03..1b803a8a2 100644
--- a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1460.log-payloads.json
+++ b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1460.log-payloads.json
@@ -124,6 +124,165 @@
     },
     "type": "llm"
   },
+  {
+    "metadata": {
+      "operation": "chat"
+    },
+    "metrics": {
+      "end": 0,
+      "start": 0
+    },
+    "name": "google-chat-operation",
+    "type": null
+  },
+  {
+    "input": {
+      "config": {
+        "maxOutputTokens": 24,
+        "temperature": 0
+      },
+      "contents": [
+        {
+          "parts": [
+            {
+              "text": "Reply with exactly MADRID."
+            }
+          ],
+          "role": "user"
+        }
+      ],
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metrics": {
+      "completion_tokens": "<number>",
+      "duration": 0,
+      "end": 0,
+      "prompt_tokens": "<number>",
+      "start": 0,
+      "tokens": "<number>"
+    },
+    "name": "generate_content",
+    "output": {
+      "candidates": [
+        {
+          "content": {
+            "parts": [
+              {
+                "text": "MADRID"
+              }
+            ],
+            "role": "model"
+          },
+          "finishReason": "STOP",
+          "index": 0
+        }
+      ],
+      "modelVersion": "gemini-2.5-flash-lite",
+      "responseId": "<responseId:2>",
+      "sdkHttpResponse": {
+        "headers": {
+          "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
+          "content-encoding": "gzip",
+          "content-type": "application/json; charset=UTF-8",
+          "date": "<timestamp>",
+          "server": "scaffolding on HTTPServer2",
+          "server-timing": "<server-timing>",
+          "transfer-encoding": "chunked",
+          "vary": "Origin, X-Origin, Referer",
+          "x-content-type-options": "nosniff",
+          "x-frame-options": "SAMEORIGIN",
+          "x-gemini-service-tier": "<x-gemini-service-tier>",
+          "x-xss-protection": "0"
+        }
+      },
+      "usageMetadata": {
+        "candidatesTokenCount": "<number>",
+        "promptTokenCount": "<number>",
+        "promptTokensDetails": [
+          {
+            "modality": "TEXT",
+            "tokenCount": "<number>"
+          }
+        ],
+        "totalTokenCount": "<number>"
+      }
+    },
+    "type": "llm"
+  },
+  {
+    "metadata": {
+      "operation": "chat-stream"
+    },
+    "metrics": {
+      "end": 0,
+      "start": 0
+    },
+    "name": "google-chat-stream-operation",
+    "type": null
+  },
+  {
+    "input": {
+      "config": {
+        "maxOutputTokens": 64,
+        "temperature": 0
+      },
+      "contents": [
+        {
+          "parts": [
+            {
+              "text": "Count from 1 to 3 and include the words one two three."
+            }
+          ],
+          "role": "user"
+        }
+      ],
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metrics": {
+      "completion_tokens": "<number>",
+      "duration": 0,
+      "end": 0,
+      "prompt_tokens": "<number>",
+      "start": 0,
+      "time_to_first_token": 0,
+      "tokens": "<number>"
+    },
+    "name": "generate_content_stream",
+    "output": {
+      "candidates": [
+        {
+          "content": {
+            "parts": [
+              {
+                "text": "Here's the count from 1 to 3, including the words:\n\n1. One\n2. Two\n3. Three"
+              }
+            ],
+            "role": "model"
+          },
+          "finishReason": "STOP"
+        }
+      ],
+      "text": "Here's the count from 1 to 3, including the words:\n\n1. One\n2. Two\n3. Three",
+      "usageMetadata": {
+        "candidatesTokenCount": "<number>",
+        "promptTokenCount": "<number>",
+        "promptTokensDetails": [
+          {
+            "modality": "TEXT",
+            "tokenCount": "<number>"
+          }
+        ],
+        "totalTokenCount": "<number>"
+      }
+    },
+    "type": "llm"
+  },
   {
     "metadata": {
       "operation": "attachment"
@@ -149,7 +308,7 @@
                 "url": {
                   "content_type": "image/png",
                   "filename": "file.png",
-                  "key": "<uuid:2>",
+                  "key": "<uuid:3>",
                   "type": "braintrust_attachment"
                 }
               }
@@ -191,7 +350,7 @@
         }
       ],
       "modelVersion": "gemini-2.5-flash-lite",
-      "responseId": "<responseId:2>",
+      "responseId": "<responseId:3>",
       "sdkHttpResponse": {
         "headers": {
           "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
@@ -417,7 +576,7 @@
         }
       ],
       "modelVersion": "gemini-2.5-flash-lite",
-      "responseId": "<responseId:3>",
+      "responseId": "<responseId:4>",
       "sdkHttpResponse": {
         "headers": {
           "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
diff --git a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1460.span-events.json b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1460.span-events.json
index 6c19af05e..6c7326660 100644
--- a/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1460.span-events.json
+++ b/e2e/scenarios/google-genai-instrumentation/__snapshots__/google-genai-v1460.span-events.json
@@ -83,10 +83,10 @@
     "has_input": false,
     "has_output": false,
     "metadata": {
-      "operation": "attachment"
+      "operation": "chat"
     },
     "metric_keys": [],
-    "name": "google-attachment-operation",
+    "name": "google-chat-operation",
     "root_span_id": "<span:1>",
     "span_id": "<span:6>",
     "span_parents": [
@@ -118,10 +118,10 @@
     "has_input": false,
     "has_output": false,
     "metadata": {
-      "operation": "stream"
+      "operation": "chat-stream"
     },
     "metric_keys": [],
-    "name": "google-stream-operation",
+    "name": "google-chat-stream-operation",
     "root_span_id": "<span:1>",
     "span_id": "<span:8>",
     "span_parents": [
@@ -150,6 +150,77 @@
     ],
     "type": "llm"
   },
+  {
+    "has_input": false,
+    "has_output": false,
+    "metadata": {
+      "operation": "attachment"
+    },
+    "metric_keys": [],
+    "name": "google-attachment-operation",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:10>",
+    "span_parents": [
+      "<span:1>"
+    ],
+    "type": null
+  },
+  {
+    "has_input": true,
+    "has_output": true,
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metric_keys": [
+      "completion_tokens",
+      "duration",
+      "prompt_tokens",
+      "tokens"
+    ],
+    "name": "generate_content",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:11>",
+    "span_parents": [
+      "<span:10>"
+    ],
+    "type": "llm"
+  },
+  {
+    "has_input": false,
+    "has_output": false,
+    "metadata": {
+      "operation": "stream"
+    },
+    "metric_keys": [],
+    "name": "google-stream-operation",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:12>",
+    "span_parents": [
+      "<span:1>"
+    ],
+    "type": null
+  },
+  {
+    "has_input": true,
+    "has_output": true,
+    "metadata": {
+      "model": "gemini-2.5-flash-lite"
+    },
+    "metric_keys": [
+      "completion_tokens",
+      "duration",
+      "prompt_tokens",
+      "time_to_first_token",
+      "tokens"
+    ],
+    "name": "generate_content_stream",
+    "root_span_id": "<span:1>",
+    "span_id": "<span:13>",
+    "span_parents": [
+      "<span:12>"
+    ],
+    "type": "llm"
+  },
   {
     "has_input": false,
     "has_output": false,
@@ -159,7 +230,7 @@
     "metric_keys": [],
     "name": "google-stream-return-operation",
     "root_span_id": "<span:1>",
-    "span_id": "<span:10>",
+    "span_id": "<span:14>",
     "span_parents": [
       "<span:1>"
     ],
@@ -180,9 +251,9 @@
     ],
     "name": "generate_content_stream",
     "root_span_id": "<span:1>",
-    "span_id": "<span:11>",
+    "span_id": "<span:15>",
     "span_parents": [
-      "<span:10>"
+      "<span:14>"
     ],
     "type": "llm"
   },
@@ -195,7 +266,7 @@
     "metric_keys": [],
     "name": "google-tool-operation",
     "root_span_id": "<span:1>",
-    "span_id": "<span:12>",
+    "span_id": "<span:16>",
     "span_parents": [
       "<span:1>"
     ],
@@ -215,9 +286,9 @@
     ],
     "name": "generate_content",
     "root_span_id": "<span:1>",
-    "span_id": "<span:13>",
+    "span_id": "<span:17>",
     "span_parents": [
-      "<span:12>"
+      "<span:16>"
     ],
     "type": "llm"
   }
diff --git a/e2e/scenarios/google-genai-instrumentation/assertions.ts b/e2e/scenarios/google-genai-instrumentation/assertions.ts
index 2d66ed8fb..3915de6c6 100644
--- a/e2e/scenarios/google-genai-instrumentation/assertions.ts
+++ b/e2e/scenarios/google-genai-instrumentation/assertions.ts
@@ -280,6 +280,11 @@ function summarizeGooglePayload(event: CapturedLogEvent): Json {
 function buildRelevantEvents(events: CapturedLogEvent[]): CapturedLogEvent[] {
   const generateOperation = findLatestSpan(events, "google-generate-operation");
   const embedOperation = findLatestSpan(events, "google-embed-operation");
+  const chatOperation = findLatestSpan(events, "google-chat-operation");
+  const chatStreamOperation = findLatestSpan(
+    events,
+    "google-chat-stream-operation",
+  );
   const attachmentOperation = findLatestSpan(
     events,
     "google-attachment-operation",
@@ -303,6 +308,16 @@ function buildRelevantEvents(events: CapturedLogEvent[]): CapturedLogEvent[] {
       "embed_content",
       "google-genai.embedContent",
     ]),
+    chatOperation,
+    findGoogleSpan(events, chatOperation?.span.id, [
+      "generate_content",
+      "google-genai.generateContent",
+    ]),
+    chatStreamOperation,
+    findGoogleSpan(events, chatStreamOperation?.span.id, [
+      "generate_content_stream",
+      "google-genai.generateContentStream",
+    ]),
     attachmentOperation,
     findGoogleSpan(events, attachmentOperation?.span.id, [
       "generate_content",
@@ -427,6 +442,48 @@ export function defineGoogleGenAIInstrumentationAssertions(options: {
       });
     });
 
+    test("captures trace for chat.sendMessage()", testConfig, () => {
+      const root = findLatestSpan(events, ROOT_NAME);
+      const operation = findLatestSpan(events, "google-chat-operation");
+      const span = findGoogleSpan(events, operation?.span.id, [
+        "generate_content",
+        "google-genai.generateContent",
+      ]);
+
+      expect(operation).toBeDefined();
+      expect(span).toBeDefined();
+      expect(operation?.span.parentIds).toEqual([root?.span.id ?? ""]);
+      expect(span?.row.metadata).toMatchObject({
+        model: GOOGLE_MODEL,
+      });
+      expect(span?.metrics).toMatchObject({
+        duration: expect.any(Number),
+        end: expect.any(Number),
+        start: expect.any(Number),
+      });
+    });
+
+    test("captures trace for chat.sendMessageStream()", testConfig, () => {
+      const root = findLatestSpan(events, ROOT_NAME);
+      const operation = findLatestSpan(events, "google-chat-stream-operation");
+      const span = findGoogleSpan(events, operation?.span.id, [
+        "generate_content_stream",
+        "google-genai.generateContentStream",
+      ]);
+
+      expect(operation).toBeDefined();
+      expect(span).toBeDefined();
+      expect(operation?.span.parentIds).toEqual([root?.span.id ?? ""]);
+      expect(span?.row.metadata).toMatchObject({
+        model: GOOGLE_MODEL,
+      });
+      expect(span?.metrics).toMatchObject({
+        time_to_first_token: expect.any(Number),
+        prompt_tokens: expect.any(Number),
+        completion_tokens: expect.any(Number),
+      });
+    });
+
     test("captures trace for sending an attachment", testConfig, () => {
       const root = findLatestSpan(events, ROOT_NAME);
       const operation = findLatestSpan(events, "google-attachment-operation");
diff --git a/e2e/scenarios/google-genai-instrumentation/scenario.impl.mjs b/e2e/scenarios/google-genai-instrumentation/scenario.impl.mjs
index 8d7a5fdfb..7a35ac72a 100644
--- a/e2e/scenarios/google-genai-instrumentation/scenario.impl.mjs
+++ b/e2e/scenarios/google-genai-instrumentation/scenario.impl.mjs
@@ -148,6 +148,43 @@ async function runGoogleGenAIInstrumentationScenario(sdk, options = {}) {
         }, GOOGLE_GENAI_RETRY_OPTIONS);
       });
 
+      await runOperation("google-chat-operation", "chat", async () => {
+        await withRetry(async () => {
+          const chat = client.chats.create({
+            model: GOOGLE_MODEL,
+            config: {
+              maxOutputTokens: 24,
+              temperature: 0,
+            },
+          });
+
+          await chat.sendMessage({
+            message: "Reply with exactly MADRID.",
+          });
+        }, GOOGLE_GENAI_RETRY_OPTIONS);
+      });
+
+      await runOperation(
+        "google-chat-stream-operation",
+        "chat-stream",
+        async () => {
+          await withRetry(async () => {
+            const chat = client.chats.create({
+              model: GOOGLE_MODEL,
+              config: {
+                maxOutputTokens: 64,
+                temperature: 0,
+              },
+            });
+
+            const stream = await chat.sendMessageStream({
+              message: "Count from 1 to 3 and include the words one two three.",
+            });
+            await collectAsync(stream);
+          }, GOOGLE_GENAI_RETRY_OPTIONS);
+        },
+      );
+
       await runOperation(
         "google-attachment-operation",
         "attachment",
diff --git a/js/src/vendor-sdk-types/google-genai.ts b/js/src/vendor-sdk-types/google-genai.ts
index d81f1b560..b0216c721 100644
--- a/js/src/vendor-sdk-types/google-genai.ts
+++ b/js/src/vendor-sdk-types/google-genai.ts
@@ -16,6 +16,7 @@ export interface GoogleGenAIConstructor {
 
 export interface GoogleGenAIClient {
   models: GoogleGenAIModels;
+  chats: GoogleGenAIChats;
 }
 
 export interface GoogleGenAIModels {
@@ -30,6 +31,10 @@ export interface GoogleGenAIModels {
   ) => Promise<GoogleGenAIEmbedContentResponse>;
 }
 
+export interface GoogleGenAIChats {
+  modelsModule?: GoogleGenAIModels;
+}
+
 // Requests
 
 export interface GoogleGenAIGenerateContentParams {
diff --git a/js/src/wrappers/google-genai.test.ts b/js/src/wrappers/google-genai.test.ts
index 8723debfa..4f7b0782a 100644
--- a/js/src/wrappers/google-genai.test.ts
+++ b/js/src/wrappers/google-genai.test.ts
@@ -273,6 +273,92 @@ describe("google genai client unit tests", TEST_SUITE_OPTIONS, () => {
     });
   });
 
+  test("google genai chat API uses the wrapped models module", async () => {
+    class FakeChats {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      public constructor(public modelsModule: any) {}
+
+      public create(params: {
+        model: string;
+        config?: Record<string, unknown>;
+      }) {
+        return {
+          sendMessage: (messageParams: { message: string }) =>
+            this.modelsModule.generateContent({
+              model: params.model,
+              contents: messageParams.message,
+              config: params.config,
+            }),
+        };
+      }
+    }
+
+    class FakeGoogleGenAI {
+      public models = {
+        generateContent: async () => ({
+          candidates: [
+            {
+              content: {
+                parts: [{ text: "Hello" }],
+                role: "model",
+              },
+              finishReason: "STOP",
+            },
+          ],
+          text: "Hello",
+          usageMetadata: {
+            promptTokenCount: 2,
+            candidatesTokenCount: 1,
+            totalTokenCount: 3,
+          },
+        }),
+      };
+
+      public chats = new FakeChats(this.models);
+
+      public constructor(_config: { apiKey?: string }) {}
+    }
+
+    initLogger({
+      projectName: "google-genai.test.ts",
+      projectId: "test-project-id",
+    });
+
+    const { GoogleGenAI } = wrapGoogleGenAI({
+      GoogleGenAI: FakeGoogleGenAI,
+    });
+    const fakeClient = new GoogleGenAI({ apiKey: "test-key" });
+    const chat = fakeClient.chats.create({
+      model: TEST_MODEL,
+      config: {
+        maxOutputTokens: 8,
+      },
+    });
+
+    const response = await chat.sendMessage({ message: "Say hello." });
+
+    expect(response.text).toBe("Hello");
+
+    const spans = await backgroundLogger.drain();
+    expect(spans).toHaveLength(1);
+    // eslint-disable-next-line @typescript-eslint/consistent-type-assertions, @typescript-eslint/no-explicit-any
+    const span = spans[0] as any;
+
+    expect(span).toMatchObject({
+      span_attributes: {
+        type: "llm",
+        name: "generate_content",
+      },
+      metadata: expect.objectContaining({
+        model: TEST_MODEL,
+      }),
+      input: expect.objectContaining({
+        model: TEST_MODEL,
+        contents: expect.anything(),
+      }),
+    });
+  });
+
   test("google genai tool calls", async () => {
     expect(await backgroundLogger.drain()).toHaveLength(0);
 
diff --git a/js/src/wrappers/google-genai.ts b/js/src/wrappers/google-genai.ts
index 2a0a4f18c..ecaa23511 100644
--- a/js/src/wrappers/google-genai.ts
+++ b/js/src/wrappers/google-genai.ts
@@ -1,4 +1,5 @@
 import { googleGenAIChannels } from "../instrumentation/plugins/google-genai-channels";
+import { isObject } from "../util";
 import type {
   GoogleGenAIClient,
   GoogleGenAIConstructor,
@@ -70,16 +71,30 @@ function wrapGoogleGenAIClass(
 function wrapGoogleGenAIInstance(
   instance: GoogleGenAIClient,
 ): GoogleGenAIClient {
+  const wrappedModels = wrapModels(instance.models);
+  patchGoogleGenAIChats(instance, wrappedModels);
+
   return new Proxy(instance, {
     get(target, prop, receiver) {
       if (prop === "models") {
-        return wrapModels(target.models);
+        return wrappedModels;
       }
       return Reflect.get(target, prop, receiver);
     },
   });
 }
 
+function patchGoogleGenAIChats(
+  instance: GoogleGenAIClient,
+  wrappedModels: GoogleGenAIModels,
+): void {
+  if (!isObject(instance.chats) || !("modelsModule" in instance.chats)) {
+    return;
+  }
+
+  Reflect.set(instance.chats, "modelsModule", wrappedModels);
+}
+
 function wrapModels(models: GoogleGenAIModels): GoogleGenAIModels {
   return new Proxy(models, {
     get(target, prop, receiver) {