Flux 2 Klein 4B

Black Forest Labs' fastest image model, for quick drafts and previews. Up to 1536x1024. At busy times this model may be answered by Recraft v4.1 Flash; you're then charged that model's price.

Availableby Black Forest Labs

Use this model Compare

Per image: €0.08
Context: -
Max output: -
Disclosed: 4/10

Disclosures

1 yes3 no6 open

01
Are prompts and outputs stored by SaaufAI?
Whether this gateway keeps the content of requests or responses.
Not specified
02
May the upstream provider use data for model training?
Based on the upstream provider's API terms for this model.
Not specified
03
Does the upstream provider retain data for abuse monitoring?
Many providers keep API data for a limited period (often up to 30 days).
Not specified
04
Is data processed outside the EU/EEA?
Whether requests may be routed to servers outside the EU/EEA.
Not specified
05
Is the model suitable for personal or sensitive data?
Operator recommendation for sending personal data to this model.
Not specified
06
Does the model support image input?
Whether you can send image_url content parts. Answered automatically from the model's capabilities.
No
07
Does the model support tool / function calling?
Whether the tools parameter is supported. Answered automatically from the model's capabilities.
No
08
Is the model output content-filtered by the provider?
Whether the upstream provider applies its own safety filters.
Not specified
09
Does SaaufAI enforce its own safeguards on this model?
Usage limits or content rules checked by SaaufAI before a request reaches the provider. Answered automatically from the live configuration.
Active: prompts screened for sexual content involving minors; prompts screened for cybersecurity, fraud & financial crime, illegal drug production, weapons & explosives, chemical & biological threats, violent extremism, self-harm & suicide, harassment & doxxing, adult sexual content, personal & payment data, jailbreaks & prompt injection. Prompts are screened by GPT 6 Luna Decisions, Gemini 3.5 Flash-Lite (via Google), D3; the screening model sees their content.
Yes
10
May requests be answered by a different (fallback) model?
If the model fails or a safeguard is reached, the request can be served by another model without the response saying so, possibly at a different provider with different data terms. Answered automatically.
No

Based on the upstream provider's terms. Yes or No is not a rating. how to read these.

Pricing

Images	Each	Per 100
Generated imageOne image from /v1/images/generations	€0.08	€8.00

Promotional Credits can't be used for this model.

Capabilities

Speed: Not measured yet. Measured from real traffic once there is enough.
Input: Text: supported
Image: not supported
Audio: not supported
Video: not supported
Files (PDF…): not supported
Output: Text: not supported
Image: supported
Audio: not supported
Video: not supported
Embeddings: not supported
Transcription: not supported
Decisions: not supported
Features: Streaming: supported
Function calling: not supported
Structured outputs: not supported
Reasoning: not supported
Endpoints: /v1/images/generations: supported

Details

Model id: flux-2-klein-4b
Company: Black Forest Labs
Listed: 31 Oct 2026

Quickstart

curl https://api.saauf.xyz/v1/images/generations \
  -H "Authorization: Bearer $SAAUF_API_KEY" -H "Content-Type: application/json" \
  -d '{"model": "flux-2-klein-4b", "prompt": "A red fox in snow"}'

Any OpenAI SDK works with base URL https://api.saauf.xyz/v1.

Try in the playground Get an API key

Your data

Whatever the provider does, SaaufAI itself never stores your prompts or the model's responses (only a short excerpt if a content scan flags a Playground message).

Using this model means agreeing to our Terms, the Acceptable Use Policy and the provider's own usage policy.

Flux 2 Klein 4B

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CapabilitiesCapabilities

Disclosures

Pricing

Capabilities