FLUX.2 [klein] 4B
- In Input modalities: TextImage
- Editing
- Open weights
Prices
3 offerings · prices as listedflux-2-klein-4b| Conditions/ megapixel | Megapixel | ||
|---|---|---|---|
| Input | Output · First | Output · Each additional | |
| Standard | $0.001 | $0.014 | $0.001 |
Prices from BFL pricing (opens in a new tab) (checked Sep 26, 2026)
Standard: the price a request with no conditions pays (the headline price elsewhere on the site).
Details
- Reference images
- 4
- Model ID
Not stated on Black Forest Labs’s pages: output modalities, aspect ratios, context, max output, reasoning efforts, tool use, structured output, knowledge cutoff.
Run locally
Weights: black-forest-labs/FLUX.2-klein-4B- Parameters 3.9B
- Dense
- Native precision BF16
- Max context not stated
Memory isn’t estimated for this type: it depends on resolution, length and pipeline. Its weights:
| Precision | Weights |
|---|---|
| BF16 (native)maker’s file | 7.2 GB |
| FP8maker’s file | 3.8 GB |
| NVFP4maker’s file | 2.3 GB |
Estimates; facts from the maker’s Hugging Face repositories, as of 2026-11-11. How it’s estimated
Cited scores
From third-party leaderboards, not measured by us- LMArena Text-to-Image 1,030
#33 of 38 listed models · CI 1,027–1,033 · 148,808 votes
- LMArena Image Edit 1,187
#29 of 34 listed models · CI 1,184–1,190 · 529,905 votes
- LMArena (Arena), leaderboard-dataset on Hugging Face, licensed CC BY 4.0 · License · as of Nov 8, 2026
- changes we made
Changes
All changes →No changes recorded yet.
Sources
- API reference: FLUX.2 [klein] 4B (opens in a new tab) docs.bfl.ai · checked Nov 9, 2026
- BFL pricing (opens in a new tab) bfl.ai · checked Sep 26, 2026
- black-forest-labs/flux-2-klein-4b on Replicate (opens in a new tab) replicate.com · checked Nov 8, 2026
- fal-ai/flux-2/klein/4b on fal.ai (opens in a new tab) fal.ai · checked Nov 3, 2026
- BFL release notes (opens in a new tab) docs.bfl.ai · checked Nov 8, 2026
- GitHub - black-forest-labs/flux2: Official inference repo for FLUX.2 models · GitHub (opens in a new tab) github.com · checked Nov 7, 2026
- black-forest-labs/FLUX.2-klein-4B model card (opens in a new tab) huggingface.co · checked Nov 8, 2026
- black-forest-labs/FLUX.2-klein-4B model card (opens in a new tab) huggingface.co · checked Nov 6, 2026
- black-forest-labs/FLUX.2-klein-4B files (opens in a new tab) huggingface.co · checked Nov 9, 2026
- black-forest-labs/FLUX.2-klein-4b-fp8 files (opens in a new tab) huggingface.co · checked Nov 4, 2026
- black-forest-labs/FLUX.2-klein-4b-nvfp4 files (opens in a new tab) huggingface.co · checked Nov 4, 2026
Some values on this page are still waiting to be checked against official pages: a filled dot is verified, a hollow one is not yet (with or without a source on file). How we verify data
Black Forest Labs · Germany · bfl.ai
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