Flux.1-fill
Extend an image
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MODEL GUIDE
Build with Flux.1-fill
Extend an image with Flux.1-fill. Try its settings in the playground and copy the same request into your application.
How to use this model
- Choose extend an image and adjust the settings above.
- Add the input media required by your task. Use a public URL or a media ID from your account.
- Run the request, review the result, then copy the API code.
One request, any integration
Send POST /api/v3/run with model: flux1-fill-outpaint. The API returns the run ID and expected cost. Read GET /api/v3/run/{id} for its status and result URLs, or provide a webhook URL.
In MCP, use run with the same model and parameters.
Parameters
These fields come from this model’s API schema. The server also validates input combinations and conditional limits.
| Parameter | Type | Values / default |
|---|---|---|
width | integer | 1024 |
height | integer | 1024 |
guidance_scale | number | 1 |
count | integer | 1 |
merge_into_original | boolean | false |
auto_background_prompt | boolean | false |
steps | integer | 20 |
prompt | string | Optional; validated by the model |
negative_prompt | string | Optional; validated by the model |
images | array | Up to 1 references |
webhook_url | string | Public HTTPS destination for this Run. No registration required. Deliveries use Ed25519 signatures; public keys: /.well-known/jwks.json. |
How do billing and results work?
Estimate the current request with POST /api/v3/run/estimate before generating. Generations use your Fusara balance. A successful run includes direct output URLs; save results you need before their links expire. An estimate does not create a run.
Can I use this model from an agent?
Connect your client to https://fusara.ai/mcp. Use get_model to discover the current schema, estimate_run for the expected cost, and run to start.