OpenRouterText to imageComing soon

black-forest-labs/flux-3-image-klein

Name: black-forest-labs/flux-3-image-klein
Brand: OpenRouter

black-forest-labs/flux-3-image-klein is a text to image tool from OpenRouter that runs in the background and returns images. Coming soon: listed with its price, not yet open to runs.

This tool is listed but not yet available to run.

Price pending

Pricing

Price pending.

Limits

Runs: In the background
Returns: image
Longest queue wait: 3600s
Run deadline: 1800s
Largest inline input: 1024 KB
Largest input file: 500 MB
Largest output: 4768 MB
Outputs per run: 16

Input

Field	Kind	Default	Description
`prompt` required	text	—	Text description of the desired image
`n`	number (whole) 1 to 1	—	Upper bound on the number of images to generate (1-10). Providers may return fewer images, and providers that only support single-image generation reject n > 1.
`resolution`	one of 768, 1K, 1.5K, 2K, 4K	—	Normalized resolution tier of the generated image. Concrete pixel dimensions are derived per-provider.
`aspect_ratio`	one of 21:9, 2:1, 16:9, 3:2, 7:5, 4:3, 5:4, 1:1, 4:5, 3:4, 5:7, 2:3, 9:16, 1:2, 9:21, auto	—	Normalized aspect ratio of the generated image. Providers clamp to their supported subset.
`input_references`	number (whole) 0 to 10	—	Reference images to guide image-to-image generation, as base64 data URLs or HTTP(S) URLs.

Same request in code

curl https://api.spiral.ai/v1/runs \
  -H "Authorization: Bearer $SPIRAL_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "provider": "openrouter",
    "model": "black-forest-labs/flux-3-image-klein",
    "input": {
      "prompt": "a red panda astronaut floating in space, studio lighting"
    }
  }'