FLUX.2 Klein — hosted API access
This repository is not the model weights — it documents running FLUX.2 Klein through a hosted API on apimodels.app, a multi-model gateway where one key and one OpenAI-compatible endpoint reach 110+ image, video, audio and language models.
- Original model & weights: https://huggingface.co/black-forest-labs/FLUX.2-klein-4B
- Authors: Black Forest Labs
- License: Apache-2.0 (FLUX.2 [klein] 4B)
Independent hosted-API integration. Not affiliated with or endorsed by the authors; does not redistribute their weights. All credit for the model is theirs.
What it does
The open, Apache-2.0 4B variant of Black Forest Labs’ FLUX.2 family. Text-to-image plus up to a few reference images.
A sample produced through the apimodels.app API.
Use it via API
On apimodels.app the model is served as flux-2-klein-4b. Get a key at https://apimodels.app, then:
# text-to-image (sync: pass a WxH size, get the image inline)
curl -X POST https://api.apimodels.app/v1/images/generations \
-H "Authorization: Bearer YOUR_API_KEY" -H "Content-Type: application/json" \
-d '{ "model": "flux-2-klein-4b", "prompt": "a cozy bookstore cafe, warm light", "size": "1360x768" }'
Pricing
| Tier | Price |
|---|---|
| flux-2-klein-4b | $0.006 / image (flat) |
| each reference image | +$0.0015 (up to 3) |
Failed jobs are not charged. Result files are kept for 7 days.
Links
- Run it: apimodels.app
- Original model: https://huggingface.co/black-forest-labs/FLUX.2-klein-4B