Gemini-2.5-flash-image-preview model not found, but gemini-2.0-flash-exp is

Google Cloud Build with AI Generative AI & Foundational Models
1

I built an app in python to access gemini-2.5-flash-image-preview using

model = GenerativeModel(“gemini-2.5-flash-image-preview”)

but I continually get the message:
```
Error generating image with Gemini: 404 Publisher Model projects/.../locations/us-central1/publishers/google/models/gemini-2.5-flash-image-preview was not found or your project does not have access to it. Please ensure you are using a valid model version. For more information, see: Model versions and lifecycle  |  Generative AI on Vertex AI  |  Google Cloud
```

However, if I use gemini-2.0-flash-exp, I do not get this error.

Do I need to do something to make gemini-2.5-flash-image-preview available to my project?

2

Hey Doug, the gemini-2.5-flash-image-preview model is available, but being a Preview model, you need to access it using the global endpoint rather than a specific region like us-central1. See my response in this thread: Connecting to Nano Banana - #4 by Andrew_B

I’d love to see what you build!

3

Hello Andrew, the model always responds with a 400 error?

Bzv984L6dJpfEtf
Bzv984L6dJpfEtf1511×563 83.2 KB

image
image1089×509 11.4 KB

4

Does it work if you add response_modalities ?

{
  "contents": [
    {
      "role": "user",
      "parts": [
        {
          "text": "Create a surreal scene combining these two images into one cohesive image"
        },
        {
          "fileData": {
            "mimeType": "image/png",
            "fileUri": "https://sy2zkbdh96.sharedwithexpose.com/uploads/stories/1757339717317/images/1757339810582.png"
          }
        },
        {
          "fileData": {
            "mimeType": "image/png",
            "fileUri": "https://sy2zkbdh96.sharedwithexpose.com/uploads/stories/1757339717317/images/1757339823999.png"
          }
        }
      ]
    }
  ],
  "generationConfig": {
    "responseModalities": ["TEXT", "IMAGE"]
  }
}