Start with the thing you are using
| Your workflow | Where to check |
|---|---|
| Downloaded Klein or Klein Base weights | The exact checkpoint's FLUX Kommunity License |
| A direct BFL API integration | BFL developer and API service terms |
| This website's browser studio | Our service terms plus the selected provider's applicable terms |
The Klein name alone does not identify an agreement. In particular, the Apache 2.0 license of FLUX.2 Klein 4B does not apply to the FLUX 3 weights. Start with the Distilled license or Base license attached to the repository you intend to use.
Commercial outputs have conditions
The FLUX Kommunity License defines qualifying users using gross annualized revenue below US$5 million, including affiliates. Its commercial-output grant is conditional: content filtering or review, legally required AI disclosures and the license's restrictions still apply. The threshold is not permission for every commercial activity.
Weights, derivatives and generated outputs are distinct. The license says BFL claims no ownership of outputs, but you remain responsible for their use. Redistribution has notice requirements, and training another model that performs similar functions is restricted. Read the full agreement for the scope and exceptions.
When the standard grant does not fit
Check BFL's commercial licensing options for uses outside the grant. Do not infer a commercial model license from access to a download, a free demo or an unrelated subscription.
Record the decision before starting a project
- Name the exact checkpoint or hosted service. Keep its repository revision and terms link with the project.
- Describe the intended use. Producing an image for a client, redistributing weights and training a model are different activities.
- Check your organization. Include affiliates when the relevant agreement asks for them; keep the basis for your eligibility.
- Review inputs and outputs. Confirm permission for reference photos, branding and personal likenesses. Check errors before publication.
- Keep required notices. Follow the applicable agreement's redistribution, attribution and disclosure conditions.
This checklist helps organize the review; it does not replace the publisher's binding agreement or grant additional rights. Local installation details belong in the download guide and local setup guide.
What your studio purchase covers
Flux3Klein is the website name at flux3klein.com. Paid plans retain the Rendastic Studio billing name, and Stripe card checkout uses the RedditSonar merchant account. Buying credits pays for generation service through the editor; it does not transfer model weights, issue a separate commercial license or promise exclusive rights in an image.
Review our Terms of Use, refund and cancellation policy and provider-processing disclosures. For direct integration, use the BFL API service terms linked from the publisher's website. Our studio does not become the model publisher because it calls that API.