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FLUX.2 [klein] 4B is the lightweight sibling in the FLUX.2 family—distilled for speed and efficient iteration while keeping strong prompt adherence.

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Why use it?

  • Fast iteration: 4-step distilled generation makes it great for rapid drafts.
  • Affordable: Lower per-image cost compared to larger FLUX.2 models.
  • Solid quality: Strong baseline photorealism and composition for everyday prompts.

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Details

  • Developer: Black Forest Labs
  • Variant: 4B distilled model
  • Resolution Range: 128–2048 (multiples of 16)
  • Estimated Cost: ~0.0006per1024×1024image(Runware), 0.0006 per 1024×1024 image (Runware), ~0.009 per MP (Fal.ai), and ~$0.000346 per 512×512 tile (Cloudflare).
  • Note: Costs are estimates and vary by provider, resolution, and routing.
  • Model License: Apache 2.0
This model skips prompt upsampling, so it’s best to write concise, direct prompts.