chore: update OpenAPI spec [sdk-bot] (#237)

Co-authored-by: OpenRouter SDK Bot <sdk-bot@openrouter.ai>

Author: robert-j-y

.speakeasy/in.openapi.yaml

@@ -7976,7 +7976,7 @@ components:
       description: 'OpenRouter built-in server tool: generates images from text prompts using an image generation model'
       example:
         parameters:
-          model: openai/gpt-image-1
+          model: openai/gpt-5-image
           quality: high
           size: 1024x1024
         type: openrouter:image_generation