FLUX.2-klein-9B
black-forest-labs/FLUX.2-klein-9B
Official · BF16 · safetensors
Runtime certified: Diffusers
| Precision / quantization | Format | Bits | Publisher trust | Deployment state |
|---|---|---|---|---|
| BF16 | safetensors | 16 | Official | Runtime certified |
FLUX · General · FLUX.2
FLUX.2 Klein 9B: Specs, GPU Requirements and License
FLUX.2 Klein 9B is a current Image Generation release in the FLUX family, certified from its immutable official source revision.
Non-Commercial Only
Compare this model
Total parameters9.1B
Active parametersN/A / Not directly comparable
Context windowN/A / Not directly comparable
Release statusCurrent · Current
ArchitectureRectified-flow transformer
ModalitiesText, Image
LicenseFLUX Non-Commercial License v2.0
Deployment stateDeployable with certified configuration
Commercial stateNon-Commercial Only
Release date2026-01-14
Architecture, strengths and use cases
FLUX.2 Klein 9B is an official self-hostable Black Forest Labs Image generation release. It uses Rectified-flow transformer with 9.079B. Exact checkpoint, license, runtime, and hardware evidence is tied to the verified upstream revision.
FLUX.2 Klein 9B uses Rectified-flow transformer with 9.079B. Pipeline and configuration fields are reported only where the official source publishes them.
Verified Rectified-flow transformer architecture
Official checkpoint and pipeline evidence
Official BF16, Unknown checkpoint coverage
Self-hosted Image generation workloads
Controlled model evaluation
Production deployment planning
Certified checkpoints and quantizations
Only exact, source-certified variants attached to this release are shown.
Recommended hardware
Use only the listed runtime configurations with the exact checkpoint precision. Hardware sizing considers resident pipeline memory, runtime overhead, input and output dimensions, batch size, and safety headroom.
Non-Commercial Only
The public checkpoint is technically self-hostable, but its license prohibits commercial or production use. No commercial hosting offer is shown.
License and self-hosting considerations
The exact pipeline and selected precision must fit on the chosen GPUs. Requirements vary with resolution, duration, batch size, modalities, and runtime; language-model KV-cache rules are not applied.
FLUX.2 Klein 9B is published under FLUX Non-Commercial License v2.0. The release-scoped official license link and verification date are retained with the catalogue record.
Non-Commercial Only. The public checkpoint is technically self-hostable, but its license prohibits commercial or production use. No commercial hosting offer is shown.
Alternatives and sibling variants
FLUX.2 Klein 4B, FLUX.2-dev, FLUX.2-klein-9B
Release timeline
black-forest-labs/flux/flux-2-klein-9b
Source details
Source revision: ffacaedf4c186e394a4ff9e1cf43ae38df94fd2558ef42471f552179b1867b41
Frequently asked questions
How much VRAM does FLUX.2 Klein 9B require?
The estimate uses the certified checkpoint, precision, runtime, workload dimensions, batch size, and domain-specific overhead.
Which runtimes support FLUX.2 Klein 9B?
Certified upstream runtime evidence is available for diffusers.
Can FLUX.2 Klein 9B be used commercially?
The stored commercial classification is Non-Commercial Only. Consult the official FLUX Non-Commercial License v2.0 terms for the final obligations.
Official references
Last verified: 2026-08-26