The most reliable FLUX.2 Klein API,with $500 in matched credits.
Sub-second image generation with multi-reference editing built in. Every output scored for quality. Same per-megapixel price as Black Forest Labs. Dollar-for-dollar credit match up to $500.
SOUND FAMILIAR?
What breaks when you call FLUX.2 Klein directly.
Same model, different reality once it's in production.
Failed generations
Provider returns 5xx. Generations fail mid-pipeline. Your users see errors and you pay for the retry.
No quality visibility
Outputs drift over time. You can't tell which prompts perform. Bad images reach users before anyone notices.
No fallback path
When your AI provider goes down, your pipeline goes down. No fallback.
Glue everywhere
Polling loops, retry logic, error handling. Every team rebuilds the same scaffolding.
Three steps. Zero failures.
Send your request
Same params as any other provider. Swap the endpoint, keep your code.
Auto-failover until it works
If a generation fails, we retry on our infrastructure. You never see the failure. You never pay for it.
Sentinel scores the output
Text accuracy, color match, identity preservation, artifacts. Scores land in your dashboard so you know exactly what shipped.
Evaluate
See what you are actually shipping.
Every FLUX.2 Klein generation through Runflow is evaluated by Sentinel. You get quality insights on every output: what went well, what went wrong, and where to improve your prompts.
Evaluations
2,924
last 30 days
Pass rate
89.53%
of all evaluations
Avg score
0.91
out of 1.00
Gate failures
20
0.7% of evaluations
Failed judges
1,133
0.4 per evaluation
Regenerate rate
9.68%
lower is better
Catches bad inputs before you spend on a generation.
Every result graded against the checks that matter.
One ID ties the input, the score, and the retry together.
Improve quality and user experience at the same cost.
Sentinel scores every output on text rendering, color match, identity, and artifacts. Pick the mode that fits your pipeline.
Discard bad generations automatically.
Adds a few seconds. If text breaks, the color shifts, or the score is low, the output is discarded and a fresh generation is triggered with the failure mode flagged.
Built for FLUX.2 Klein at scale.
Sub-second generation
Klein is distilled to 4 inference steps. We add zero overhead between the request and the model. Your users see images, not loading spinners.
Automatic failover
When a generation fails, Runflow retries on our infrastructure. Your users never see an error.
Multi-reference editing built in
Pass up to 4 reference images per request. Klein blends, edits, and rewrites without round trips.
Sentinel analytics included
Every output scored for text accuracy, color match, identity, and artifacts. See your quality trends in a dashboard.
Commercial license on 4B
Klein 4B ships under Apache 2.0. Use it in commercial products without a side agreement. 9B is non-commercial; pick the right variant per workload.
Free credits to prove it
Free credits on signup. Enough to run your own reliability test.
FLUX.2 Klein 9B, 9B Edit, and 4B. One API.
Every variant includes auto-failover and Sentinel quality analytics.
| Model | Category | 1MP |
|---|---|---|
| FLUX.2 [klein] 9B | Text-to-image | $0.006/MP |
| FLUX.2 [klein] 9B (Edit) | Image edit | $0.006/MP |
| FLUX.2 [klein] 4B | Text-to-image | $0.014/MP |
Enterprise-grade AI image generation API infrastructure.
Without the enterprise sales cycle.
Your images never touch our storage. Processing happens in isolated environments with automatic cleanup. Compliant by default.
SOC 2 Type II compliant.
Zero customer data retention
Images are processed and returned. We don’t store your customers’ data.
Isolated processing
Every job runs in its own sandboxed environment. No cross-contamination between customers.
99.9% uptime SLA
Multi-region infrastructure with automatic failover. GPU capacity is always available.
FLUX.2 Klein API: common questions
Match your first $500 in credits.
Deposit any amount in your first 30 days and we add a matching credit within 24 hours, up to $500 in total. Put $500, you get $500 back.
Stop losing generations.
Start seeing quality.
Free credits on signup. Match your first $500 in credits, dollar for dollar.