braintrustdata · Abhijeet Prasad (AbhiPrasad) · Apr 30, 2026 · Apr 30, 2026 · Apr 30, 2026
diff --git a/py/pyproject.toml b/py/pyproject.toml
@@ -345,7 +345,7 @@ latest = "autoevals==0.2.0"
 "0.0.129" = "autoevals==0.0.129"
 
 [tool.braintrust.matrix.google-genai]
-latest = "google-genai==1.73.1"
+latest = "google-genai==1.74.0"
 "1.30.0" = "google-genai==1.30.0"
 
 [tool.braintrust.matrix.dspy]

diff --git a/py/src/braintrust/integrations/auto_test_scripts/test_auto_google_genai.py b/py/src/braintrust/integrations/auto_test_scripts/test_auto_google_genai.py
@@ -1,5 +1,7 @@
 """Test auto_instrument for Google GenAI (no uninstrument available)."""
 
+import os
+
 from braintrust.auto import auto_instrument
 from braintrust.integrations.test_utils import autoinstrument_test_context
 
@@ -19,7 +21,11 @@
 
     client = Client()
     response = client.models.generate_content(
-        model="gemini-2.0-flash-001",
+        model=(
+            "gemini-3.1-flash-lite-preview"
+            if os.environ.get("BRAINTRUST_TEST_PACKAGE_VERSION") == "latest"
+            else "gemini-2.0-flash-001"
+        ),
         contents="Say hi",
         config=types.GenerateContentConfig(max_output_tokens=100),
     )

diff --git a/py/src/braintrust/integrations/google_genai/cassettes/latest/test_auto_google_genai.yaml b/py/src/braintrust/integrations/google_genai/cassettes/latest/test_auto_google_genai.yaml
@@ -6,7 +6,7 @@ interactions:
       Accept:
       - '*/*'
       Accept-Encoding:
-      - gzip, deflate, zstd
+      - gzip, deflate
       Connection:
       - keep-alive
       Content-Length:
@@ -16,34 +16,33 @@ interactions:
       Host:
       - generativelanguage.googleapis.com
       user-agent:
-      - google-genai-sdk/1.60.0 gl-python/3.13.3
+      - google-genai-sdk/1.74.0 gl-python/3.12.12
       x-goog-api-client:
-      - google-genai-sdk/1.60.0 gl-python/3.13.3
+      - google-genai-sdk/1.74.0 gl-python/3.12.12
     method: POST
-    uri: https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-001:generateContent
+    uri: https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-lite-preview:generateContent
   response:
     body:
-      string: !!binary |
-        H4sIAAAAAAAC/61Ry07DMBC85yuMz03lpA8eF4QKUgtUVBDxRpUh28TCtSPboURV/x0naVoHrvhg
-        rXZmd3Zn1x5C+IOKmMXUgMYn6MVmEFpXf4lJYUAYCzQpm8yoMntu/dZObCkGvssiPGbIpKDgAI3l
-        ClklNEEp8AwVMkdGxrQ4fRXYqd3s4rfOXlFJDmW7pYyBN/RNQ8ALJphOb4FqKUraXXQzwzuUfiXX
-        MsmUfC+H9kmXBIMjQsKgPwyHg8Ow1z/2GulKFOeaJjAFQ60rdLc7ti2WmYnkJ4iRzCtXwlrF8bAF
-        B8EWN9JQ3oZ6nT9d9bnVZNz11rHdLk85M0W5YXTxGGHHINMaqjHIc3z8PeI/aQVBW8zb3qU+1T0o
-        zeqbJLC0V/LDLvEXnOrUJySoumIFOpNCwyQuebNBVtDnq4fLp3k6z6czrUaKnCXY23g/hhi4Mq4C
-        AAA=
+      string: "{\n  \"candidates\": [\n    {\n      \"content\": {\n        \"parts\":
+        [\n          {\n            \"text\": \"Hi! How can I help you today?\",\n
+        \           \"thoughtSignature\": \"EjQKMgEMOdbHN1lJWA89gycYPMD3z+d6uLyVv8JHe6Ez0OHI/luhPiV5HI8Oo7aM8zfWN9oH\"\n
+        \         }\n        ],\n        \"role\": \"model\"\n      },\n      \"finishReason\":
+        \"STOP\",\n      \"index\": 0\n    }\n  ],\n  \"usageMetadata\": {\n    \"promptTokenCount\":
+        3,\n    \"candidatesTokenCount\": 9,\n    \"totalTokenCount\": 12,\n    \"promptTokensDetails\":
+        [\n      {\n        \"modality\": \"TEXT\",\n        \"tokenCount\": 3\n      }\n
+        \   ]\n  },\n  \"modelVersion\": \"gemini-3.1-flash-lite-preview\",\n  \"responseId\":
+        \"X3PzaaCuFKy6_uMP-fHewQs\"\n}\n"
     headers:
       Alt-Svc:
       - h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
-      Content-Encoding:
-      - gzip
       Content-Type:
       - application/json; charset=UTF-8
       Date:
-      - Thu, 22 Jan 2026 21:44:31 GMT
+      - Thu, 30 Apr 2026 15:21:03 GMT
       Server:
       - scaffolding on HTTPServer2
       Server-Timing:
-      - gfet4t7; dur=430
+      - gfet4t7; dur=1029
       Transfer-Encoding:
       - chunked
       Vary:
@@ -54,8 +53,12 @@ interactions:
       - nosniff
       X-Frame-Options:
       - SAMEORIGIN
+      X-Gemini-Service-Tier:
+      - standard
       X-XSS-Protection:
       - '0'
+      content-length:
+      - '659'
     status:
       code: 200
       message: OK

diff --git a/.../braintrust/integrations/google_genai/cassettes/latest/test_basic_completion[stream].yaml b/.../braintrust/integrations/google_genai/cassettes/latest/test_basic_completion[stream].yaml
@@ -3,40 +3,41 @@ interactions:
     body: '{"contents": [{"parts": [{"text": "What is the capital of France?"}], "role":
       "user"}], "generationConfig": {"maxOutputTokens": 100}}'
     headers:
-      accept:
+      Accept:
       - '*/*'
-      accept-encoding:
+      Accept-Encoding:
       - gzip, deflate
-      connection:
+      Connection:
       - keep-alive
-      content-length:
+      Content-Length:
       - '133'
-      content-type:
+      Content-Type:
       - application/json
-      host:
+      Host:
       - generativelanguage.googleapis.com
       user-agent:
-      - google-genai-sdk/1.41.0 gl-python/3.13.3
+      - google-genai-sdk/1.74.0 gl-python/3.12.12
       x-goog-api-client:
-      - google-genai-sdk/1.41.0 gl-python/3.13.3
+      - google-genai-sdk/1.74.0 gl-python/3.12.12
     method: POST
-    uri: https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-001:streamGenerateContent?alt=sse
+    uri: https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-lite-preview:streamGenerateContent?alt=sse
   response:
     body:
-      string: "data: {\"candidates\": [{\"content\": {\"parts\": [{\"text\": \"The\"}],\"role\":
-        \"model\"}}],\"usageMetadata\": {\"promptTokenCount\": 8,\"totalTokenCount\":
-        8,\"promptTokensDetails\": [{\"modality\": \"TEXT\",\"tokenCount\": 8}]},\"modelVersion\":
-        \"gemini-2.0-flash-001\",\"responseId\": \"_qTiaLjwK6vpgbUP2uvA-QU\"}\r\n\r\ndata:
-        {\"candidates\": [{\"content\": {\"parts\": [{\"text\": \" capital of France\"}],\"role\":
-        \"model\"}}],\"usageMetadata\": {\"promptTokenCount\": 8,\"totalTokenCount\":
-        8,\"promptTokensDetails\": [{\"modality\": \"TEXT\",\"tokenCount\": 8}]},\"modelVersion\":
-        \"gemini-2.0-flash-001\",\"responseId\": \"_qTiaLjwK6vpgbUP2uvA-QU\"}\r\n\r\ndata:
-        {\"candidates\": [{\"content\": {\"parts\": [{\"text\": \" is Paris.\\n\"}],\"role\":
-        \"model\"},\"finishReason\": \"STOP\"}],\"usageMetadata\": {\"promptTokenCount\":
-        7,\"candidatesTokenCount\": 8,\"totalTokenCount\": 15,\"promptTokensDetails\":
-        [{\"modality\": \"TEXT\",\"tokenCount\": 7}],\"candidatesTokensDetails\":
-        [{\"modality\": \"TEXT\",\"tokenCount\": 8}]},\"modelVersion\": \"gemini-2.0-flash-001\",\"responseId\":
-        \"_qTiaLjwK6vpgbUP2uvA-QU\"}\r\n\r\n"
+      string: "data: {\"candidates\": [{\"content\": {\"parts\": [{\"text\": \"The
+        capital\"}],\"role\": \"model\"},\"index\": 0}],\"usageMetadata\": {\"promptTokenCount\":
+        8,\"candidatesTokenCount\": 2,\"totalTokenCount\": 10,\"promptTokensDetails\":
+        [{\"modality\": \"TEXT\",\"tokenCount\": 8}]},\"modelVersion\": \"gemini-3.1-flash-lite-preview\",\"responseId\":
+        \"InPzaZ3qM_OW_uMPgIPKgAg\"}\r\n\r\ndata: {\"candidates\": [{\"content\":
+        {\"parts\": [{\"text\": \" of France is Paris.\"}],\"role\": \"model\"},\"index\":
+        0}],\"usageMetadata\": {\"promptTokenCount\": 8,\"candidatesTokenCount\":
+        7,\"totalTokenCount\": 15,\"promptTokensDetails\": [{\"modality\": \"TEXT\",\"tokenCount\":
+        8}]},\"modelVersion\": \"gemini-3.1-flash-lite-preview\",\"responseId\": \"InPzaZ3qM_OW_uMPgIPKgAg\"}\r\n\r\ndata:
+        {\"candidates\": [{\"content\": {\"parts\": [{\"text\": \"\",\"thoughtSignature\":
+        \"EjQKMgEMOdbHSvZ6i6U0AqmiTPMv1nuMqGtV/EjgT0eIv2dKVM/WLFZe+TeYLcWCrlHdMp9v\"}],\"role\":
+        \"model\"},\"finishReason\": \"STOP\",\"index\": 0}],\"usageMetadata\": {\"promptTokenCount\":
+        8,\"candidatesTokenCount\": 7,\"totalTokenCount\": 15,\"promptTokensDetails\":
+        [{\"modality\": \"TEXT\",\"tokenCount\": 8}]},\"modelVersion\": \"gemini-3.1-flash-lite-preview\",\"responseId\":
+        \"InPzaZ3qM_OW_uMPgIPKgAg\"}\r\n\r\n"
     headers:
       Alt-Svc:
       - h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
@@ -45,11 +46,11 @@ interactions:
       Content-Type:
       - text/event-stream
       Date:
-      - Sun, 05 Oct 2025 17:03:58 GMT
+      - Thu, 30 Apr 2026 15:20:02 GMT
       Server:
       - scaffolding on HTTPServer2
       Server-Timing:
-      - gfet4t7; dur=391
+      - gfet4t7; dur=635
       Transfer-Encoding:
       - chunked
       Vary:

diff --git a/...rc/braintrust/integrations/google_genai/cassettes/latest/test_basic_completion[sync].yaml b/...rc/braintrust/integrations/google_genai/cassettes/latest/test_basic_completion[sync].yaml
@@ -3,46 +3,46 @@ interactions:
     body: '{"contents": [{"parts": [{"text": "What is the capital of France?"}], "role":
       "user"}], "generationConfig": {"maxOutputTokens": 100}}'
     headers:
-      accept:
+      Accept:
       - '*/*'
-      accept-encoding:
+      Accept-Encoding:
       - gzip, deflate
-      connection:
+      Connection:
       - keep-alive
-      content-length:
+      Content-Length:
       - '133'
-      content-type:
+      Content-Type:
       - application/json
-      host:
+      Host:
       - generativelanguage.googleapis.com
       user-agent:
-      - google-genai-sdk/1.41.0 gl-python/3.13.3
+      - google-genai-sdk/1.74.0 gl-python/3.12.12
       x-goog-api-client:
-      - google-genai-sdk/1.41.0 gl-python/3.13.3
+      - google-genai-sdk/1.74.0 gl-python/3.12.12
     method: POST
-    uri: https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-001:generateContent
+    uri: https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-lite-preview:generateContent
   response:
     body:
-      string: !!binary |
-        H4sIAAAAAAAC/61RTU/DMAy991dEOa9T1jFWcYMNJhCICSqEBAiZ1uuitUlJsvEx7b+TtmuXwpUc
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-        3sgP+sxfZKCXPmODqilVqAspNF4mJe/1PeJwNZudQf6dm9WcbSbTj1NGvZ33A7z5p7+oAgAA
+      string: "{\n  \"candidates\": [\n    {\n      \"content\": {\n        \"parts\":
+        [\n          {\n            \"text\": \"The capital of France is Paris.\",\n
+        \           \"thoughtSignature\": \"EjQKMgEMOdbHr79RjAy6QLknd/Xh1snrpBl9Cp5L5kUqjtOkUYJDeTCClNymmjJOiu0eWCen\"\n
+        \         }\n        ],\n        \"role\": \"model\"\n      },\n      \"finishReason\":
+        \"STOP\",\n      \"index\": 0\n    }\n  ],\n  \"usageMetadata\": {\n    \"promptTokenCount\":
+        8,\n    \"candidatesTokenCount\": 7,\n    \"totalTokenCount\": 15,\n    \"promptTokensDetails\":
+        [\n      {\n        \"modality\": \"TEXT\",\n        \"tokenCount\": 8\n      }\n
+        \   ]\n  },\n  \"modelVersion\": \"gemini-3.1-flash-lite-preview\",\n  \"responseId\":
+        \"InPzaf9869b-4w_ZjtWACA\"\n}\n"
     headers:
       Alt-Svc:
       - h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
-      Content-Encoding:
-      - gzip
       Content-Type:
       - application/json; charset=UTF-8
       Date:
-      - Sun, 05 Oct 2025 17:03:58 GMT
+      - Thu, 30 Apr 2026 15:20:02 GMT
       Server:
       - scaffolding on HTTPServer2
       Server-Timing:
-      - gfet4t7; dur=390
+      - gfet4t7; dur=2097
       Transfer-Encoding:
       - chunked
       Vary:
@@ -53,8 +53,12 @@ interactions:
       - nosniff
       X-Frame-Options:
       - SAMEORIGIN
+      X-Gemini-Service-Tier:
+      - standard
       X-XSS-Protection:
       - '0'
+      content-length:
+      - '660'
     status:
       code: 200
       message: OK

diff --git a/...ntrust/integrations/google_genai/cassettes/latest/test_basic_completion_async[async].yaml b/...ntrust/integrations/google_genai/cassettes/latest/test_basic_completion_async[async].yaml
@@ -3,46 +3,46 @@ interactions:
     body: '{"contents": [{"parts": [{"text": "What is the capital of France?"}], "role":
       "user"}], "generationConfig": {"maxOutputTokens": 100}}'
     headers:
-      accept:
+      Accept:
       - '*/*'
-      accept-encoding:
+      Accept-Encoding:
       - gzip, deflate
-      connection:
+      Connection:
       - keep-alive
-      content-length:
+      Content-Length:
       - '133'
-      content-type:
+      Content-Type:
       - application/json
-      host:
+      Host:
       - generativelanguage.googleapis.com
       user-agent:
-      - google-genai-sdk/1.41.0 gl-python/3.13.3
+      - google-genai-sdk/1.74.0 gl-python/3.12.12
       x-goog-api-client:
-      - google-genai-sdk/1.41.0 gl-python/3.13.3
+      - google-genai-sdk/1.74.0 gl-python/3.12.12
     method: POST
-    uri: https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-001:generateContent
+    uri: https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-lite-preview:generateContent
   response:
     body:
-      string: !!binary |
-        H4sIAAAAAAAC/61RUUvDMBB+768IeV5H2rG1+iZTQdjY0CLCFDnXaxfWJjXJxDH2303bdUv11TyE
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+      string: "{\n  \"candidates\": [\n    {\n      \"content\": {\n        \"parts\":
+        [\n          {\n            \"text\": \"The capital of France is Paris.\",\n
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+        \         }\n        ],\n        \"role\": \"model\"\n      },\n      \"finishReason\":
+        \"STOP\",\n      \"index\": 0\n    }\n  ],\n  \"usageMetadata\": {\n    \"promptTokenCount\":
+        8,\n    \"candidatesTokenCount\": 7,\n    \"totalTokenCount\": 15,\n    \"promptTokensDetails\":
+        [\n      {\n        \"modality\": \"TEXT\",\n        \"tokenCount\": 8\n      }\n
+        \   ]\n  },\n  \"modelVersion\": \"gemini-3.1-flash-lite-preview\",\n  \"responseId\":
+        \"I3PzacShL_ac_uMP_rqQiQg\"\n}\n"
     headers:
       Alt-Svc:
       - h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
-      Content-Encoding:
-      - gzip
       Content-Type:
       - application/json; charset=UTF-8
       Date:
-      - Sun, 05 Oct 2025 17:03:59 GMT
+      - Thu, 30 Apr 2026 15:20:03 GMT
       Server:
       - scaffolding on HTTPServer2
       Server-Timing:
-      - gfet4t7; dur=321
+      - gfet4t7; dur=808
       Transfer-Encoding:
       - chunked
       Vary:
@@ -53,8 +53,12 @@ interactions:
       - nosniff
       X-Frame-Options:
       - SAMEORIGIN
+      X-Gemini-Service-Tier:
+      - standard
       X-XSS-Protection:
       - '0'
+      content-length:
+      - '661'
     status:
       code: 200
       message: OK