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Gemini Image Editing

POST /v1beta/models/{model}:generateContent
As of April 14, 2026, the latest Crazyrouter retest for Gemini image-editing-related routes showed:
  • native gemini-3.1-flash-image-preview:generateContent can now return image output again
  • native gemini-2.5-flash-image:generateContent can also return image output, but billing consistency is still under review
  • the Nano Banana-family public Images-compatible route through POST /v1/images/generations is currently unhealthy
The unhealthy path right now is the older public Images-compatible layer, not every Gemini-native image path. For editing and reference-image workloads, the current guidance should converge on native Gemini generateContent.
Do not keep documenting Nano Banana-family POST /v1/images/generations as the stable image-editing route. nano-banana-2 should move to gemini-3.1-flash-image-preview:generateContent, while nano-banana remains controlled-testing only.
The more usable path right now is Nano Banana 2, which now points to native Gemini gemini-3.1-flash-image-preview:generateContent. Nano Banana now keeps only the controlled-test note for gemini-2.5-flash-image:generateContent, not a stable production recommendation.

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Current Recommendation

  1. If your goal is Gemini text-to-image, use Gemini Image Generation
  2. If your goal is a currently usable reference-image editing route, start with Nano Banana 2
  3. If you must evaluate nano-banana, follow the controlled-test guidance on Nano Banana
  4. Do not keep treating POST /v1/images/generations as the default entry point for the Nano Banana family

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Retest Template

This is now the more recommended minimal template for retesting or integration. The same workload should no longer be documented through /v1/images/generations: 
curl "https://crazyrouter.com/v1beta/models/gemini-3.1-flash-image-preview:generateContent?key=YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {"text": "Edit this image: change the background to blue and keep the main square visible. Return image output."},
          {
            "inlineData": {
              "mimeType": "image/png",
              "data": "iVBORw0KGgoAAA..."
            }
          }
        ]
      }
    ],
    "generationConfig": {
      "responseModalities": ["IMAGE"]
    }
  }'