Skip to main content
Model creator on ModelRunner
Black Forest Labs logo

Black Forest Labs

black-forest-labs

Black Forest Labs's 6 models on ModelRunner span Image-to-Image and Text-to-Image, from $0.03 per image upward.

6 public models — every one runnable in a free playground, through the REST API and JavaScript SDK, or from an AI assistant over MCP.

Black Forest Labs models & pricing

What you can build with Black Forest Labs models

  • Generate images while tuning quality vs. speed with step count and guidance FLUX.2 [flex]
  • Render legible typography and accurate text inside a generated image FLUX.2 [flex]
  • Iterate from a fast low-step draft to a high-step final render FLUX.2 [flex]
  • Create photorealistic scenes and product shots from a text prompt FLUX.2 [flex]
  • Fine-tune prompt adherence by raising the guidance scale FLUX.2 [flex]
  • Generate final production-grade images with maximum fidelity FLUX.2 [pro]
  • Create photorealistic product and editorial shots from a text prompt FLUX.2 [pro]
  • Produce brand-consistent campaign visuals in high volume FLUX.2 [pro]

Browse by capability

Call a Black Forest Labs model in one request

Every endpoint shares the same lifecycle: submit to the queue, poll the status URL, fetch the result. Swap the endpoint to switch models — nothing else changes.

cURL

curl -X POST https://queue.modelrunner.run/black-forest-labs/flux-2/flex \
  -H "Authorization: Key $MRUN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "prompt": "..." }'
# → { "request_id": "...", "status_url": "...", "response_url": "..." }

Use Black Forest Labs models from Claude & Cursor

Connect the ModelRunner MCP server once and your AI assistant can run every Black Forest Labs model on this page as a tool — authorized via OAuth, results returned as hosted URLs in the conversation.

Claude Code

claude mcp add --transport http modelrunner https://mcp.modelrunner.run/mcp

Frequently asked questions

What Black Forest Labs models can I run on ModelRunner?

The catalog has 6 public Black Forest Labs models: FLUX.2 [flex], FLUX.2 [pro], FLUX.1 Kontext [max] and 3 more. They cover image-to-image and text-to-image. Each one has its own page with a free playground, the full input schema, and copy-paste code.

How much do Black Forest Labs models cost?

Pay-per-use, with no subscription: the 4 Black Forest Labs models billed per image start at $0.03, and every page publishes its own rate — some are tiered, so a lower resolution or a shorter clip costs less per run. You buy credits and pay only for what you generate.

How do I call a Black Forest Labs model from the API?

POST to https://queue.modelrunner.run/black-forest-labs/flux-2/flex with an Authorization: Key header and the input fields as the top-level JSON body (no wrapper object), then poll the returned status_url and fetch the result from response_url. The JavaScript SDK (@modelrunner/client) wraps that in a single subscribe() call, which is the one place an { input } object is used.

Can I run Black Forest Labs models from Claude or Cursor?

Yes. Connect the ModelRunner MCP server (https://mcp.modelrunner.run/mcp) once and all 6 Black Forest Labs models become tools your assistant can call with run_model — authorized over OAuth 2.1, so no API key goes into a config file. Results come back as hosted URLs in the conversation.

Browse the full model catalog, compare live per-configuration rates on the pricing page, see curated sets on explore, or view every model creator.

Other creators in image-to-image