Image model for prompt-driven generation, editing, and visual design workflows
FLUX.2 Klein 4B by black-forest-labs is offered by 3 providers on this page. Public prices are shown for 1 of them. Its reference price is $1.00 per 1M tokens. It also has 1 free ($0) channel; free tiers usually carry rate limits, and subscription-covered access bills $0 per token only after the subscription fee.
The context window is 128,000 tokens at the reference host, but hosts report different limits, from 40,960 to 128,000, so the usable window depends on the provider you pick. Accepted input modalities are Text and Image. The weights are open, so it can also be self-hosted or served through a gateway of your choice. Providers report the capability flags inconsistently, so verify a specific feature against the host you plan to use. Its training knowledge cuts off at 2025-06.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Nvidia black-forest-labs/flux_2-klein-4b | Cloud | Free | — | — | 40,960 ⚠ | 40,960 | ||
| NEAR AI Cloud black-forest-labs/FLUX.2-klein-4B | Gateway | $1.00 | $1.00 | — | — | 128,000 | 128,000 | |
| Vercel AI Gateway bfl/flux-2-klein-4b | Cloud | — | — | — | — | 0 ⚠ | 0 | hostTable.undisclosed |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
1 more channels offer $0 (Nvidia); free tiers usually have rate limits and no SLA, excluded from ranking.
Elo from human preference matchups run by Artificial Analysis. Each arena is anchored separately, so Elo is only comparable within one arena, against the other models on that board, and the 95% confidence interval (shown as ±) indicates how much of a gap is noise. Rank is over the whole arena, including models not listed here.