diff --git a/llm/client.go b/llm/client.go
index a7ae1d4..074db52 100644
--- a/llm/client.go
+++ b/llm/client.go
@@ -207,7 +207,7 @@ func (c *Client) completeOpenAI(ctx context.Context, messages []Message) (string
 
 type anthropicRequest struct {
 	AnthropicVersion string         `json:"anthropic_version,omitempty"`
-	Model       string         `json:"model"`
+	Model       string         `json:"model,omitempty"`
 	MaxTokens   int            `json:"max_tokens"`
 	System      string         `json:"system,omitempty"`
 	Messages    []anthropicMsg `json:"messages"`