diff --git a/src/providers/openai.rs b/src/providers/openai.rs
index 15dde1d..cba07f8 100644
--- a/src/providers/openai.rs
+++ b/src/providers/openai.rs
@@ -612,10 +612,18 @@ impl OpenAIProvider {
                     message
                 }
             }).collect::<Vec<_>>(),
-            "temperature": request.temperature.or(self.temperature).unwrap_or(0.7),
-            "max_tokens": request.max_tokens.or(self.max_tokens),
         });
 
+        // 只有配置了才添加 temperature，否则让模型使用默认值
+        if let Some(temp) = request.temperature.or(self.temperature) {
+            body["temperature"] = json!(temp);
+        }
+
+        // 只有配置了才添加 max_tokens
+        if let Some(tokens) = request.max_tokens.or(self.max_tokens) {
+            body["max_tokens"] = json!(tokens);
+        }
+
         for (key, value) in self.request_model_extra() {
             body[key] = value.clone();
         }