Black Forest Labs: FLUX.2 Klein 4B
black-forest-labs/flux.2-klein-4bFLUX.2 [klein] 4B is the fastest and most cost-effective model in the FLUX.2 family, optimized for high-throughput use cases while maintaining excellent image quality. Pricing is based on the output...
- Context window
- 40,960 tokens
- Input
- text · image
- Output
- image
- Relay support
- Price book only
Reference prices & points
Our global markup: 15% · 1 USD = 10,000 points · Price version 0
| Billing unit | OpenRouter / USD | Our reference / USD | Points |
|---|---|---|---|
| Input / 1M tokens | $0 | $0 | 0 |
| Output / 1M tokens | $0 | $0 | 0 |
| Per output image | $0.00000342 | $0.00000393 | 0.03930664 |
Actual charge = the OpenRouter request cost × the markup locked for that request. Catalogue rates may be routing references; caching, long context, images and audio are charged when used. Listed prices do not mean every capability is available through this relay.
Catalogue time: 2026-11-12T00:00:40.986Z · Live catalogue
View all upstream price fields
{
"prompt": "0",
"completion": "0",
"image_output": "0.00000341796875"
}Integration & availability
This model is listed in the price book but cannot be called from this workspace. The workspace supports text chat, vision and optional web search. Turn on Image mode to find eligible image generators. Other modalities are currently price-book entries.