diff --git a/internal/runtime/executor/codex_executor.go b/internal/runtime/executor/codex_executor.go
index b2fba5aa..48209153 100644
--- a/internal/runtime/executor/codex_executor.go
+++ b/internal/runtime/executor/codex_executor.go
@@ -76,6 +76,7 @@ func (e *CodexExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth, re
 	}
 
 	body, _ = sjson.SetBytes(body, "stream", true)
+	body, _ = sjson.DeleteBytes(body, "previous_response_id")
 
 	url := strings.TrimSuffix(baseURL, "/") + "/responses"
 	recordAPIRequest(ctx, e.cfg, body)
@@ -161,6 +162,8 @@ func (e *CodexExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.Au
 		}
 	}
 
+	body, _ = sjson.DeleteBytes(body, "previous_response_id")
+
 	url := strings.TrimSuffix(baseURL, "/") + "/responses"
 	recordAPIRequest(ctx, e.cfg, body)
 	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))