FLUX.2 Klein 4B

by Black Forest LabsImage generation

Image model for prompt-driven generation, editing, and visual design workflows

Context: 41K tokens
Max output: 36,864 tokens
Parameters: 3.9B total
Released: 2026-01-14
Weights: Open
Licence: apache-2.0

Weights on Hugging Face

black-forest-labs/flux.2-klein-4b · also seen as bfl/flux-2-klein-4b

Specifications

Full facts as recorded, incl. what is unknown.

Released: 2026-01-14
Weights: Opennot gated
License: apache-2.0
Input: Image, Text
Output: Image
Context window: 40,960 max across endpoints
Max output: 36,864
Providers: 3 + 2 gateways, not counted as providers
Epoch Capabilities Index: not evaluated
Direct price range: no comparable direct price

More details

Last updated: 2026-06-08
Knowledge cutoff: 2025-06
Weights link: Hugging Face · black-forest-labs/FLUX.2-klein-4B
Parameters: 3.9B total

Capabilities

Across all endpoints: supported if any endpoint supports it.

Tool calling
Parallel toolsunknown
Structured outputunknown
Reasoning
Image input
PDF input
Audio input
Audio outputunknown
Video input
Prompt cachingunknown
Web searchunknown
Computer useunknown
System messagesunknown
Assistant prefillunknown
Temperature
Streamingunknown
Attachments

Endpoints

One row per provider and variant; gateways are listed separately.

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Cost calculator

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Heads up: prices are indicative list rates scraped from provider pricing pages; verify with the provider before relying on them. Report incorrect data for this model