diff --git a/server-rs/crates/platform-image/tests/image_provider.rs b/server-rs/crates/platform-image/tests/image_provider.rs
index 9d7cb256c..4ceea0692 100644
--- a/server-rs/crates/platform-image/tests/image_provider.rs
+++ b/server-rs/crates/platform-image/tests/image_provider.rs
@@ -232,6 +232,12 @@ fn resolve_image_provider_rejects_business_model_and_accepts_concrete_models() {
         resolve_image_provider(GPT_IMAGE_2_5_EDIT_MODEL),
         Ok(ImageProvider::Tiantoken)
     );
+    // 中文注释：`gpt-image-2` 是历史持久化值，仍按 Tiantoken 路由；它不得被当成
+    // 未知 model 拒绝，也不得被静默改写成当前业务模型后再发往上游。
+    assert_eq!(
+        resolve_image_provider(GPT_IMAGE_2_MODEL),
+        Ok(ImageProvider::Tiantoken)
+    );
     assert_eq!(
         resolve_image_provider("gemini-3.1-flash-image-preview"),
         Ok(ImageProvider::VectorEngine)