Flux.1 Dev
Flux.1 Dev is Black Forest Labs' 2024 open-weight stills sibling of Flux.1 Pro, not the live flagship and not a fully MIT gift. Current stills and open-weight rows sit on FLUX.2 ([dev] / [klein]) at bfl.ai/models/flux-2 and bfl.ai/pricing. github.com/black-forest-labs/flux is the official FLUX.1 inference repo: 25,892 stars, GitHub SPDX Apache-2.0.
Compare FLUX 3 if you wanted the live multimodal model, Flux.1 Pro if you wanted the 2024 paid sibling, and GPT Image 2 if you wanted OpenAI stills.
Key Features
- Previous open-weight stills: Flux.1 Dev shipped in August 2024 next to Flux.1 Pro. Confirm whether your workflow should move to FLUX.2 [dev] or [klein].
- License is not "do anything": BFL's live pricing sells open-weights license packs (Builder / Platform / Professional / Enterprise / Synthetic Data). Do not call Flux.1 Dev a fully commercial MIT dump.
- Inference repo vs model card: The flux GitHub repo is Apache-2.0 inference code. Model weights still have BFL's own non-commercial / licensed terms. Confirm Hugging Face and the self-hosted terms.
- Not the homepage model: Image generation on the 2026 homepage is FLUX 3 (soon) plus FLUX.2.
Use Cases
- People with a 2024 Flux.1 Dev ComfyUI workflow who need the catalog corrected.
- People who thought the weights were fully MIT.
Limitation: We did not re-download the 2024 weight card. Confirm Hugging Face and BFL self-hosted terms before you ship commercially.
Pricing
bfl.ai/pricing and GitHub on 2026-08-17.
| Piece | Price | Notes from those pages |
|---|---|---|
| Flux.1 Dev weights | Previous open-weight SKU | Confirm Hugging Face / self-hosted terms. Not a MIT commercial dump. |
| FLUX.2 open weights | License rows | [klein] / [dev] packs on the live pricing page. |
| flux inference repo | $0 code | Apache-2.0. 25,892 stars. |
If a leftover blog still says Flux.1 Dev is fully open source and still the BFL default, treat this table as the source.
Getting Started
- Open bfl.ai/models/flux-2 before you download 2024 Dev weights.
- Confirm FLUX 3 if you wanted video and audio.
- Confirm Flux.1 Pro if you still have an old paid key.
- Do not call it fully MIT.
Frequently Asked Questions
Is Flux.1 Dev still the open-weight flagship?
No. Live open-weight rows on the public page are FLUX.2 [dev] / [klein].
Is it fully open source?
The inference repo is Apache-2.0. Weights are under BFL's own terms. Confirm before commercial use.
Same as Flux.1 Pro?
Sibling 2024 SKUs. Pro was the paid API stills model. Both are previous catalog.
Alternatives
- FLUX 3: Live multimodal BFL model.
- Flux.1 Pro: 2024 paid stills sibling.
- GPT Image 2: OpenAI stills.
Tips
- Quote FLUX.2 [dev]/[klein] as the live weight rows.
- Split inference-repo Apache-2.0 from weight terms.
- Confirm self-hosted terms before you sell a commercial fine-tune.
Conclusion
Flux.1 Dev is a 2024 BFL open-weight stills SKU, not a fully MIT flagship. Start at bfl.ai/models/flux-2, then decide whether FLUX 3 already covers the model you need.
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