diff --git a/fern/openapi.json b/fern/openapi.json
index cef851d4..936b8c59 100644
--- a/fern/openapi.json
+++ b/fern/openapi.json
@@ -28104,14 +28104,14 @@
             "anyOf": [
               {
                 "type": "string",
-                "enum": ["low", "medium", "high"]
+                "enum": ["low", "medium", "high", "max"]
               },
               {
                 "type": "null"
               }
             ],
             "title": "Effort",
-            "description": "Effort level for Opus 4.5 model (controls token conservation). Not setting this gives similar performance to 'high'."
+            "description": "Effort level for supported Anthropic models (controls token spending). 'max' is only available on Opus 4.6. Not setting this gives similar performance to 'high'."
           },
           "strict": {
             "type": "boolean",
diff --git a/letta/schemas/model.py b/letta/schemas/model.py
index fa1c14cb..621bd4f0 100644
--- a/letta/schemas/model.py
+++ b/letta/schemas/model.py
@@ -282,10 +282,10 @@ class AnthropicModelSettings(ModelSettings):
         description="Soft control for how verbose model output should be, used for GPT-5 models.",
     )
 
-    # Opus 4.5 effort parameter
-    effort: Optional[Literal["low", "medium", "high"]] = Field(
+    # Effort parameter for Opus 4.5, Opus 4.6, and Sonnet 4.6
+    effort: Optional[Literal["low", "medium", "high", "max"]] = Field(
         None,
-        description="Effort level for Opus 4.5 model (controls token conservation). Not setting this gives similar performance to 'high'.",
+        description="Effort level for supported Anthropic models (controls token spending). 'max' is only available on Opus 4.6. Not setting this gives similar performance to 'high'.",
     )
 
     # Anthropic supports strict mode for tool calling - defaults to False