@@ -4270,11 +4270,15 @@ components:
         image_url:
           properties:
             detail:
-              description: Image detail level for vision models
+              description: >-
+                Image detail level for vision models. `original` is an OpenRouter extension (not in the OpenAI Chat
+                Completions spec) requesting true original-resolution media; it is downgraded to `high` for providers
+                that lack an original-resolution tier.
               enum:
                 - auto
                 - low
                 - high
+                - original
               type: string
             url:
               description: 'URL of the image (data: URLs supported)'