Model comparison
FLUX.1-dev vs FLUX.2 Klein 4B
Compare FLUX.1-dev and FLUX.2 Klein 4B: input/output $/Mtoken, context window, modalities, and license. OpenRouter-synced pricing.
Black Forest Labs
FLUX.1-dev
Image model for prompt-driven generation, editing, and visual design workflows
Black Forest Labs
FLUX.2 Klein 4B
Image model for prompt-driven generation, editing, and visual design workflows
| Metric | FLUX.1-dev | FLUX.2 Klein 4B |
|---|---|---|
| Provider | Black Forest Labs | Black Forest Labs |
| Context window | 4,096 | 128,000 |
| Input $/Mtok | $0 | $1.00 |
| Output $/Mtok | $0 | $1.00 |
| Modalities | text | text, vision |
| License | closed | open-weights |
Quick take
On input price, FLUX.1-dev is cheaper at $0/Mtok. For context window, FLUX.2 Klein 4B leads with 128,000 tokens.
Pick based on your workload: high-volume cheap inference vs long-document / agent loops. Enterprise DNA can wire either model into Omni with evals, secrets, and job orchestration.