What Would You Like to See with the Gateway?

Support Image Generation via the OpenRouter endpoint.

Context for your Request

OpenRouter supports image-generation-capable models such as openai/gpt-5-image-mini. Portkey Gateway supports OpenRouter as a provider, and Portkey documentation indicates OpenAI-compatible image generation support. However, when sending an OpenAI-compatible chat completion request for OpenRouter image generation through Portkey Gateway, the request succeeds but the returned message has no usable image payload. Please confirm whether OpenRouter image generation through Portkey Gateway is intended to be supported. If it is supported, the gateway appears to drop or fail to map the image output payload for models like openai/gpt-5-image-mini.

x-portkey-api-key: <PORTKEY_API_KEY>
x-portkey-provider: openrouter
x-portkey-strict-open-ai-compliance: false
Authorization: Bearer <OPENROUTER_API_KEY>

Request shape:

client.chat.completions.create(
    model="openai/gpt-5-image-mini",
    messages=[{"role": "user", "content": [{"type": "text", "text": "Simple black letters HB on a white background."}]}],
    modalities=["image", "text"],
    stream=False,
    max_tokens=1024,
)

The request returns successfully, but the image payload is empty. The reproducer reports:

{
  "provider": "openrouter",
  "model": "openai/gpt-5-image-mini",
  "image_count": 0,
  "empty_image_payload": true
}