diff --git a/run_agent.py b/run_agent.py
index 65dd3c2f03e19..1f6970fca9881 100644
--- a/run_agent.py
+++ b/run_agent.py
@@ -2087,7 +2087,8 @@ def _build_api_kwargs(self, api_messages: list) -> dict:
         _is_openrouter = "openrouter" in self.base_url.lower()
         _is_nous = "nousresearch" in self.base_url.lower()
 
-        if _is_openrouter or _is_nous:
+        _is_mistral = "api.mistral.ai" in self.base_url.lower()
+        if (_is_openrouter or _is_nous) and not _is_mistral:
             if self.reasoning_config is not None:
                 extra_body["reasoning"] = self.reasoning_config
             else:
@@ -2612,7 +2613,6 @@ def _handle_max_iterations(self, messages: list, api_call_count: int) -> str:
             summary_extra_body = {}
             _is_openrouter = "openrouter" in self.base_url.lower()
             _is_nous = "nousresearch" in self.base_url.lower()
-            if _is_openrouter or _is_nous:
                 if self.reasoning_config is not None:
                     summary_extra_body["reasoning"] = self.reasoning_config
                 else: