[Black Forest Labs](/ai-gateway/models/labs/bfl)

# FLUX.2 \[klein\] 4B

FLUX.2 \[klein\] 4B is Black Forest Labs's Apache 2.0 licensed compact image model. It delivers sub-second text-to-image, image editing, and multi-reference generation from a single checkpoint. Your use is subject to Black Forest Labs's [Terms](https://bfl.ai/legal/terms-of-service) & [Privacy](https://bfl.ai/legal/privacy-policy) Policies.

Image Gen

[Use with AI Gateway](https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Futm_source%3Dgateway-model-page%26utm_campaign%3Dai-gateway-models&title=Get+Started+with+Vercel+AI+Gateway) [View docs](https://vercel.com/docs/ai-gateway)

AI SDKChat Completions

```
1import { experimental_generateImage as generateImage } from 'ai';
2

3const result = await generateImage({
4  model: 'bfl/flux-2-klein-4b',
5  prompt: 'A red balloon on a wooden table.'
6});
```

[Read docs](https://vercel.com/docs/ai-gateway/sdks-and-apis/ai-sdk)

[Overview](/ai-gateway/models/flux-2-klein-4b) [About](/ai-gateway/models/flux-2-klein-4b/about) [Providers](/ai-gateway/models/flux-2-klein-4b/providers) [Similar](/ai-gateway/models/flux-2-klein-4b/similar) [FAQ](/ai-gateway/models/flux-2-klein-4b/faq)

## [Copy link to heading](#more-models-by-black-forest-labs)More models by Black Forest Labs

All

Image

Video

| Model |
| --- |

| Context | Latency | Throughput | Input | Output | Cache | Web Search | Capabilities | Providers | ZDR | No Training | Free Tier | Release Date |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |

| ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) [bfl/flux\-3-video](/ai-gateway/models/flux-3-video) |  |  |  |  | $0.06/sec+5 more |  | — |  | ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) |  |  |  | 08/04/2026 |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) [bfl/flux-2-klein-9b](/ai-gateway/models/flux-2-klein-9b) |  |  |  |  | $0.015/MP |  | — |  | ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) |  |  |  | 01/15/2026 |  |
| ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) [bfl/flux-2-flex](/ai-gateway/models/flux-2-flex) |  |  |  |  | $0.06/MP |  | — |  | ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) |  |  |  | 11/25/2025 |  |
| ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) [bfl/flux-kontext-max](/ai-gateway/models/flux-kontext-max) | 512 |  |  |  | $0.08/img |  | — |  | ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) |  |  |  | 05/29/2025 |  |
| ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) [bfl/flux-kontext-pro](/ai-gateway/models/flux-kontext-pro) | 512 |  |  |  | $0.04/img |  | — |  | ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) ![prodia logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fprodia.png&w=48&q=75) |  |  |  | 05/29/2025 |  |
| ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) [bfl/flux-pro-1.0-fill](/ai-gateway/models/flux-pro-1.0-fill) |  |  |  |  | $0.05/img |  | — |  | ![bfl logo](/vc-ap-vercel-marketing/_next/image?url=https%3A%2F%2F7nyt0uhk7sse4zvn.public.blob.vercel-storage.com%2Fdocs-assets%2Fstatic%2Fdocs%2Fai-gateway%2Flogos%2Fblackforestlabs.png&w=48&q=75) |  |  |  | 10/01/2024 |  |