diff --git a/server-rs/crates/platform-image/src/image_provider/protocol/request.rs b/server-rs/crates/platform-image/src/image_provider/protocol/request.rs
index e5132386d..fb6f8878c 100644
--- a/server-rs/crates/platform-image/src/image_provider/protocol/request.rs
+++ b/server-rs/crates/platform-image/src/image_provider/protocol/request.rs
@@ -110,10 +110,9 @@ pub fn normalize_image_model(model: &str) -> &str {
 /// 命中即拒绝。`gpt-image-2` 仍按历史可读值接受。
 pub fn resolve_image_provider(model: &str) -> Result<ImageProvider, &'static str> {
     match normalize_image_model(model) {
-        GPT_IMAGE_2_MODEL
-        | GPT_IMAGE_2_C_MODEL
-        | GPT_IMAGE_2_5_GENERATION_MODEL
-        | GPT_IMAGE_2_5_EDIT_MODEL => Ok(ImageProvider::Tiantoken),
+        GPT_IMAGE_2_MODEL | GPT_IMAGE_2_5_GENERATION_MODEL | GPT_IMAGE_2_5_EDIT_MODEL => {
+            Ok(ImageProvider::Tiantoken)
+        }
         NANOBANANA_2_MODEL => Ok(ImageProvider::VectorEngine),
         _ => Err("不支持的图片模型"),
     }
diff --git a/server-rs/crates/platform-image/tests/image_provider.rs b/server-rs/crates/platform-image/tests/image_provider.rs
index f4d84c3f4..2111bfc13 100644
--- a/server-rs/crates/platform-image/tests/image_provider.rs
+++ b/server-rs/crates/platform-image/tests/image_provider.rs
@@ -232,6 +232,8 @@ fn nanobanana_generate_content_url_blank_model_falls_back_to_nanobanana_model()
 fn resolve_image_provider_rejects_business_model_and_accepts_concrete_models() {
     // 中文注释：业务模型名不是 provider model，必须在 api-server 任务边界先解析成具体 model。
     assert!(resolve_image_provider(GPT_IMAGE_2_5_BUSINESS_NAME).is_err());
+    // 中文注释：`gpt-image-2-c` 只是历史 fallback / 审计字符串，永不作为 provider model。
+    assert!(resolve_image_provider(GPT_IMAGE_2_C_MODEL).is_err());
 
     assert_eq!(
         resolve_image_provider(GPT_IMAGE_2_5_GENERATION_MODEL),