diff --git a/server-rs/crates/platform-image/src/vector_engine/raw_edit.rs b/server-rs/crates/platform-image/src/vector_engine/raw_edit.rs
index 02f08c998..3c26e1bd0 100644
--- a/server-rs/crates/platform-image/src/vector_engine/raw_edit.rs
+++ b/server-rs/crates/platform-image/src/vector_engine/raw_edit.rs
@@ -136,6 +136,8 @@ pub async fn create_vector_engine_raw_image_edit(
         .text("n", "1".to_string())
         .text("prompt", prompt.to_string())
         .text("size", format!("{}x{}", options.width, options.height))
+        // GPT-Image-2 的图片编辑响应契约只返回 b64_json，不处理 URL 响应。
+        .text("response_format", "b64_json".to_string())
         .part(
             "image",
             Part::stream_with_length(image_bytes.clone(), image_bytes.len() as u64)