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. Rechecked 2026-08-17: bfl.ai now leads with FLUX 3. 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. Drop leftover fully open source / Pro-level quality as if it were MIT forever and still the current default.

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. Recheck 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. Recheck 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 comparing leftover Flux.1 Dev vs FLUX.2 [dev].
• People who thought the weights were fully MIT.

Limitation: We did not re-download the 2024 weight card. Recheck Hugging Face and BFL self-hosted terms before you ship commercially.

Pricing

bfl.ai/pricing and GitHub on 2026-08-17.

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

1. Open bfl.ai/models/flux-2 before you download 2024 Dev weights.
2. Recheck FLUX 3 if you wanted video and audio.
3. Recheck Flux.1 Pro if you still have an old paid key.
4. Do not call it fully MIT.

Frequently Asked Questions

Is Flux.1 Dev still the open-weight flagship?

No. Live open-weight rows we opened are FLUX.2 [dev] / [klein].

Is it fully open source?

The inference repo is Apache-2.0. Weights are under BFL's own terms. Recheck 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

1. Quote FLUX.2 [dev]/[klein] as the live weight rows.
2. Split inference-repo Apache-2.0 from weight terms.
3. Recheck 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.