Black Forest Labs: FLUX.2 Klein 4B

Providers

Available routing options for this model through OneInfer.

Pricing

Current OneInfer pricing for this model.

1. 1

   Generate your access token

   Use your API key to generate the JWT access token required by the Models API. Generate access token

2. 2

   Add the JWT token

   Copy the generated JWT token and replace JWT_TOKEN in the example below.

3. 3

   Check your credits

   If your balance is too low, add credits before calling the model.

4. 4

   Run the API example

   Choose your preferred language, copy the example, and send your first model request.

   cURLPythonJavaScriptNode.jsGo

   Copy code

   curl -X POST https://api.oneinfer.ai/v1/ula/generate-image \
     -H "Authorization: Bearer YOUR_JWT_TOKEN" \
     -H "Content-Type: application/json" \
     -d '{
     "provider": "blackforestlabs",
     "model": "blackforestlabs/flux-2-klein-4b",
     "messages": [
       {
         "role": "user",
         "content": "A futuristic city skyline at dusk"
       }
     ],
     "number": 1,
     "size": "512x512",
     "quality": "standard"
   }'