How much does flux-2-klein-4b:free cost per 1M tokens?

Input is priced at $0.00 per 1M tokens, output at $0.00 per 1M tokens. Billing is per token, no rounding to batch sizes.

How do I access flux-2-klein-4b:free via API?

Send requests to the UnoRouter /v1/chat/completions endpoint with model=flux-2-klein-4b:free. Any OpenAI-compatible client library works. Authentication uses a standard Bearer token.

Flux: flux-2-klein-4b:free

Name: flux-2-klein-4b:free
Brand: Flux

flux-2-klein-4b:free

VisionFiles

Released Jan 15, 2026Updated Aug 27, 2026

The fastest, most lightweight FLUX.2 model with sub-second generation and open weights (Apache 2.0).

Inputs used for the providers' own purposes

At least one provider of this model uses your inputs for its own purposes, for example to train AI models. Do not enter personal data of third parties or sensitive data. You can object to this use at any time in your account settings or via "Manage consents" in the chat.

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