diff --git a/src/sequrity/types/messages/__init__.py b/src/sequrity/types/messages/__init__.py
index 780bb5d..ed782dd 100644
--- a/src/sequrity/types/messages/__init__.py
+++ b/src/sequrity/types/messages/__init__.py
@@ -17,6 +17,7 @@
     OutputConfigParam,
     TextBlockParam,
     ThinkingBlockParam,
+    ThinkingConfigAdaptiveParam,
     ThinkingConfigDisabledParam,
     ThinkingConfigEnabledParam,
     ThinkingConfigParam,
@@ -68,6 +69,7 @@
     "ThinkingConfigParam",
     "ThinkingConfigEnabledParam",
     "ThinkingConfigDisabledParam",
+    "ThinkingConfigAdaptiveParam",
     "MetadataParam",
     "OutputConfigParam",
     "JSONOutputFormatParam",
diff --git a/src/sequrity/types/messages/request.py b/src/sequrity/types/messages/request.py
index 8fe7a2a..380fe13 100644
--- a/src/sequrity/types/messages/request.py
+++ b/src/sequrity/types/messages/request.py
@@ -325,8 +325,21 @@ class ThinkingConfigDisabledParam(BaseModel):
     model_config = ConfigDict(extra="ignore")
 
 
+class ThinkingConfigAdaptiveParam(BaseModel):
+    """Adaptive thinking configuration.
+
+    Claude automatically decides whether to use extended thinking based on
+    the complexity of the request.
+    See https://docs.anthropic.com/en/api/messages
+    """
+
+    type: Literal["adaptive"] = Field(default="adaptive", description="Thinking is adaptive.")
+
+    model_config = ConfigDict(extra="ignore")
+
+
 ThinkingConfigParam = Annotated[
-    ThinkingConfigEnabledParam | ThinkingConfigDisabledParam,
+    ThinkingConfigEnabledParam | ThinkingConfigDisabledParam | ThinkingConfigAdaptiveParam,
     Field(discriminator="type"),
 ]