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Issue: Gemini 2.5 flash image doesn't generate images

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
46/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
go
Domain
backend-api-design

Research direction

Start by tracing how the Playground request for gemini/gemini-2.5-flash-image is routed to Gemini and how the response output is translated into the API response; the issue does not name relevant files or tests. Compare the result with the provider’s expected image-generation response and add or run a regression test for this request. Done means the response includes the generated image rather than only text.

Written by the indexing model from the issue text.

Description

Describe the bug

Request:

{
  "model": "gemini/gemini-2.5-flash-image",
  "input": [
    {
      "role": "user",
      "content": "generate an image with cat drinking water from the rain"
    }
}

Response:

{
  "id": "hweYaqLDGrSbkdUP46ul0Ac",
  "object": "response",
  "created_at": 1788348314,
  "model": "gemini-2.5-flash-image",
  "provider": "gemini",
  "status": "completed",
  "output": [
    {
      "id": "msg_cab17ffc-8cd6-47b0-b837-137c10c04f50",
      "type": "message",
      "role": "assistant",
      "status": "completed",
      "content": [
        {
          "type": "output_text",
          "text": "Here is an image of a cat drinking water from the rain: ",
          "annotations": []
        }
      ]
    }
  ],
  "usage": {
    "input_tokens": 11,
    "output_tokens": 1304,
    "total_tokens": 1315,
    "input_tokens_details": {
      "cached_tokens": 0,
      "audio_tokens": 0,
      "text_tokens": 11,
      "image_tokens": 0
    }
  }
}

The test was done via GoModel Dashboard -> Playground

Dominant language
Go
Stars
1.2k
Forks
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Avg merge
14h 43m
Merged PRs (30d)
142

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