FLUX.2 Flex vs FLUX.2 Klein 4B
black-forest-labs/flux.2-flex · black-forest-labs/flux.2-klein-4b
As of October 24, 2026, both FLUX.2 Flex and FLUX.2 Klein 4B are available through UberLLM on one OpenAI-compatible key, routed to the cheapest healthy seller, with UberLLM's 10% fee already in the price. FLUX.2 Flex is $0.033 per megapixel; FLUX.2 Klein 4B is $0.0083 per megapixel.
FLUX.2 Flex vs FLUX.2 Klein 4B, side by side
| Spec | FLUX.2 Flex | FLUX.2 Klein 4B |
|---|---|---|
| Unit price | $0.033 per megapixel | $0.0083 per megapixel |
| Input modalities | text | text |
| Output modalities | image | image |
| % off list | 45% off | 45% off |
Live prices via UberLLM, routed to the cheapest healthy seller. The price shown includes UberLLM’s 10% fee. Updated October 24, 2026.
FLUX.2 Flex vs FLUX.2 Klein 4B — FAQ
Is FLUX.2 Flex or FLUX.2 Klein 4B cheaper?
UberLLM routes each request to the cheapest healthy seller for the model. See the live per-unit prices in the table above.
What's the price difference between FLUX.2 Flex and FLUX.2 Klein 4B?
Both are listed live on UberLLM; the table above shows each model's current price per unit.
Can I use both FLUX.2 Flex and FLUX.2 Klein 4B with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.