FLUX.2 Klein 4B
by Black Forest Labsblack-forest-labs/flux.2-klein-4b
LLMCompare cannot run FLUX.2 Klein 4B yet.No route to this model is configured on this site yet. Its prices and parameters are listed below for reference.
See the models that can be run nowFLUX.2 Klein 4B at a glance
- Maximum output
- 36,864 tokens
- Accepts
- Text, Image
- Returns
- Image
- Features
- Image input
- Released
- 14 Jan 2026
- Knowledge cutoff
- Not published
Model facts synced from the OpenRouter model list on 21 Oct 2026.
FLUX.2 Klein 4B pricing by route
A route is the service LLMCompare calls to reach the model. FLUX.2 Klein 4B has 1 route. Prices are in US dollars.
| Route | On LLMCompare | Image outputper 1M image tokens | Price verified on | Source |
|---|---|---|---|---|
| OpenRouterDefault | Not configured | $3.42 | openrouter.ai/black-forest-labs/flux.2-klein-4b |
The cost shown in an LLMCompare report is calculated from these prices as they were at the time of the run.
Cost calculator
Estimate what a batch of calls to FLUX.2 Klein 4B costs. The starting numbers are examples. Change them to match your task.
The provider reports this number for each image. It depends on size and quality.
- Cost per call
- $0.0034
- 5 credits
- Cost of 10 calls
- $0.0342
- 50 credits
Calculated from the OpenRouter prices verified on 21 Oct 2026. Credits are the cost plus a 20% service fee, at $0.001 per credit, rounded up for each call, with a minimum of 1 per call. A real run is charged for the usage the provider reports.
Parameters you can set
These are the parameters LLMCompare can set when it calls the model through OpenRouter.
| Parameter | Type | Range or options | Default |
|---|---|---|---|
size | One of | 1024x10241536x10241024x15362048x2048 | Provider default |
aspect_ratio | One of | 1:13:22:34:33:416:99:16 | Provider default |
About FLUX.2 Klein 4B
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...
Description as published for this model. LLMCompare has not edited it.
Models to compare with FLUX.2 Klein 4B
Image models from the same provider and models at the nearest price. The order is not a ranking.
| Add to comparison | Model | Input priceper 1M tokens | Image priceunit under each price | Accepts | Released | On LLMCompare |
|---|---|---|---|---|---|---|
FLUX 3 Image KleinBlack Forest Labsblack-forest-labs/flux-3-image-klein | — | $1.92per 1M image tokens | Text, Image | No route yet | ||
FLUX.2 ProBlack Forest Labsblack-forest-labs/flux.2-pro | — | $7.32per 1M image tokens | Text, Image | No route yet | ||
FLUX 3 ImageBlack Forest Labsblack-forest-labs/flux-3-image | — | $9.82per 1M image tokens | Text, Image | No route yet | ||
Krea 2 Medium TurboKreakrea/krea-2-medium-turbo | — | $3.59per 1M image tokens | Text, Image | No route yet | ||
Seedream 5.0 FlashByteDance Seedbytedance-seed/seedream-5-0-flash | — | $4.31per 1M image tokens | Text, Image | No route yet | ||
Qwen Image 2.1 TurboQwenqwen/qwen-image-2.1-turbo | — | $4.41per 1M image tokens | Text, Image | No route yet |
Questions about FLUX.2 Klein 4B
- How much does FLUX.2 Klein 4B cost?
- On the OpenRouter route, FLUX.2 Klein 4B costs $3.42 per 1M image tokens, in US dollars. LLMCompare verified this price on 21 Oct 2026.
- What inputs does FLUX.2 Klein 4B accept?
- FLUX.2 Klein 4B accepts these inputs: Text, Image. FLUX.2 Klein 4B returns: Image.
- Can I test FLUX.2 Klein 4B on my own data?
- Not yet. LLMCompare lists the prices and parameters of FLUX.2 Klein 4B, but no route to FLUX.2 Klein 4B is configured on LLMCompare, so it cannot be selected for an evaluation.