diff --git a/packages/text-generation/src/celeste_text_generation/providers/openai/models.py b/packages/text-generation/src/celeste_text_generation/providers/openai/models.py
index 4ec67fb3..ed0b5247 100644
--- a/packages/text-generation/src/celeste_text_generation/providers/openai/models.py
+++ b/packages/text-generation/src/celeste_text_generation/providers/openai/models.py
@@ -71,6 +71,38 @@
             TextGenerationParameter.OUTPUT_SCHEMA: Schema(),
         },
     ),
+    Model(
+        id="gpt-5.1",
+        provider=Provider.OPENAI,
+        display_name="GPT-5.1",
+        streaming=True,
+        parameter_constraints={
+            Parameter.MAX_TOKENS: Range(min=1, max=128000),
+            TextGenerationParameter.THINKING_BUDGET: Choice(
+                options=["minimal", "low", "medium", "high"]
+            ),
+            TextGenerationParameter.VERBOSITY: Choice(
+                options=["low", "medium", "high"]
+            ),
+            TextGenerationParameter.OUTPUT_SCHEMA: Schema(),
+        },
+    ),
+    Model(
+        id="gpt-5.1-codex",
+        provider=Provider.OPENAI,
+        display_name="GPT-5.1 Codex",
+        streaming=True,
+        parameter_constraints={
+            Parameter.MAX_TOKENS: Range(min=1, max=128000),
+            TextGenerationParameter.THINKING_BUDGET: Choice(
+                options=["minimal", "low", "medium", "high"]
+            ),
+            TextGenerationParameter.VERBOSITY: Choice(
+                options=["low", "medium", "high"]
+            ),
+            TextGenerationParameter.OUTPUT_SCHEMA: Schema(),
+        },
+    ),
     Model(
         id="gpt-5-mini",
         provider=Provider.OPENAI,