Graphicdesign
#121,004 Elo
35.8% win rate
Bl
Black Forest Labs: FLUX.2 Klein 4B
Free allowance
Up to10,000neurons / day
via Cloudflare
FLUX.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...
- Input
- text
- image
- Output
- image
- Generates images
Providers
Available through 1 free provider. Use the model ID and API settings below to connect.
* The provider match may differ from this model. Check its docs for details.
Benchmarks
Compare scores and explore results by category.
Category performance
Elo scale: 0–1,200. Higher is better.
Image
#121,063 Elo
38.8% win rate
Logo
#121,059 Elo
38% win rate
Imageediting
#81,056 Elo
39.2% win rate
Frequently asked questions
Free access, setup, and what to expect.
FLUX.2 Klein 4B is available with up to 10,000 neurons / day free through Cloudflare. Free allowances can change. Check the FLUX.2 Klein 4B provider limits before you start.
To use FLUX.2 Klein 4B, choose one of the listed FLUX.2 Klein 4B API providers and follow the provider’s account and API-key setup guide. Copy the FLUX.2 Klein 4B model ID and connection settings for your chosen provider into your app or API client. Model IDs can differ between providers. API requests go directly to the provider; Free Models is a comparison site.
FLUX.2 Klein 4B accepts text and image as listed input formats. Listed output formats include image. Image or audio input support does not imply image or audio generation. Check the chosen provider’s FLUX.2 Klein 4B documentation for supported file types and request formats.
FLUX.2 Klein 4B has a listed context window of 41K tokens. Tokens are small pieces of content rather than a word count. Instructions, conversation history, and other inputs use context space, and the response also needs room. The maximum output length for FLUX.2 Klein 4B may be smaller than the context window and can vary by provider.
Neither reasoning nor tool calling support is listed for FLUX.2 Klein 4B. Reasoning enables additional processing for complex problems. Tool calling allows a model to request functions that your app executes. Check the chosen provider’s documentation for capability availability and setup.
Review the listed FLUX.2 Klein 4B benchmark results to compare performance on measured tasks. Compare scores within the same benchmark: coding indexes, Elo ratings, and win rates measure different things. The index comparison charts include only scored free models listed on Free Models. Evaluate FLUX.2 Klein 4B on examples from your own task alongside context size and provider limits.