diff --git a/converter.go b/converter.go
index c0366f1..c94df05 100644
--- a/converter.go
+++ b/converter.go
@@ -14,6 +14,10 @@ func ConvertOpenAIRequest(req *ChatCompletionRequest) *AnthropicRequest {
 		Messages:  convertMessages(remainingMessages),
 		System:    system,
 		MaxTokens: 32000,
+		Thinking: &AnthropicThinking{
+			Type:         "enabled",
+			BudgetTokens: 10000,
+		},
 	}
 
 	if req.MaxTokens != nil {
diff --git a/types.go b/types.go
index 0dbb926..abf90fb 100644
--- a/types.go
+++ b/types.go
@@ -94,16 +94,22 @@ type FunctionCall struct {
 // Anthropic Types
 
 type AnthropicRequest struct {
-	Model         string              `json:"model"`
-	Messages      []AnthropicMessage  `json:"messages"`
-	System        string              `json:"system,omitempty"`
-	MaxTokens     int                 `json:"max_tokens"`
-	Stream        bool                `json:"stream,omitempty"`
-	Temperature   *float64            `json:"temperature,omitempty"`
-	TopP          *float64            `json:"top_p,omitempty"`
-	StopSequences []string            `json:"stop_sequences,omitempty"`
-	Tools         []AnthropicTool     `json:"tools,omitempty"`
-	ToolChoice    *AnthropicToolChoice `json:"tool_choice,omitempty"`
+	Model         string                `json:"model"`
+	Messages      []AnthropicMessage    `json:"messages"`
+	System        string                `json:"system,omitempty"`
+	MaxTokens     int                   `json:"max_tokens"`
+	Stream        bool                  `json:"stream,omitempty"`
+	Temperature   *float64              `json:"temperature,omitempty"`
+	TopP          *float64              `json:"top_p,omitempty"`
+	StopSequences []string              `json:"stop_sequences,omitempty"`
+	Tools         []AnthropicTool       `json:"tools,omitempty"`
+	ToolChoice    *AnthropicToolChoice  `json:"tool_choice,omitempty"`
+	Thinking      *AnthropicThinking    `json:"thinking,omitempty"`
+}
+
+type AnthropicThinking struct {
+	Type         string `json:"type"`
+	BudgetTokens int    `json:"budget_tokens,omitempty"`
 }
 
 type AnthropicMessage struct {