remove the top_p too

core/src/providers/anthropic.rs

@@ -933,6 +933,7 @@ impl AnthropicLLM {
             // We can't pass a temperature different than 1.0 in thinking mode: https://docs.anthropic.com/en/docs/build-with-claude/extended-thinking#important-considerations-when-using-extended-thinking
             // TODO(2025-03-18 aubin): we should surface this sooner
             body["temperature"] = 1.0f32.into();
+            body.as_object_mut().unwrap().remove("top_p");
         }
 
         let url = self.messages_uri()?.to_string();