{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/flux-2-klein/","md":"https://postcutoff.com/m/flux-2-klein/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"flux-2-klein","name":"FLUX.2 [klein] (4B / 9B)","org":"Black Forest Labs","family":"FLUX.2","released":"2026-01-14","status":"current","type":"image-gen","modality_in":["text","image"],"modality_out":["image"],"open_weights":true,"model_license":"apache-2.0 (4B); FLUX Non-Commercial License (9B)","context_window":null,"max_output":null,"knowledge_cutoff":null,"pricing":{"per_image":0.014,"unit":"per image from (4B; 9B from 0.015; text-to-image and editing)","source":"https://docs.bfl.ai/quick_start/pricing"},"price_line":"$0.014 per image","access":[{"provider":"BFL API","model_id":"flux-2-klein-4b","endpoint":"https://api.bfl.ai/v1/flux-2-klein-4b","docs":"https://docs.bfl.ai/flux_2/flux2_overview"},{"provider":"BFL API","model_id":"flux-2-klein-9b","endpoint":"https://api.bfl.ai/v1/flux-2-klein-9b","docs":"https://docs.bfl.ai/flux_2/flux2_overview"},{"provider":"Hugging Face","url":"https://huggingface.co/black-forest-labs/FLUX.2-klein-4B"},{"provider":"Hugging Face","url":"https://huggingface.co/black-forest-labs/FLUX.2-klein-9B"}],"capabilities":[{"name":"Sub-second generation and editing","detail":"Size-distilled FLUX.2 variants aimed at sub-second inference for both text-to-image and editing.","first":false,"discovered":"launch","source":"https://docs.bfl.ai/flux_2/flux2_overview"},{"name":"Apache-2.0 open weights (4B)","detail":"4B checkpoint is Apache 2.0 - commercially usable open weights; base (undistilled) checkpoints published for fine-tuning/LoRA training.","first":false,"discovered":"launch","source":"https://huggingface.co/black-forest-labs/FLUX.2-klein-4B"},{"name":"KV-cached 9B variant","detail":"flux-2-klein-9b-preview / FLUX.2-klein-9b-kv (Mar 2026) add KV caching for faster multi-reference editing.","first":false,"discovered":"later","source":"https://docs.bfl.ai/flux_2/flux2_overview"}],"entry":null,"notes":"Snapshots flux-2-klein-9b (fixed) and flux-2-klein-9b-preview (latest, KV caching). HF also hosts -base, fp8 and nvfp4 variants. Release date = HF repo creation date.","verified":"2026-09-29","body_md":"Small, fast FLUX.2 models for real-time/local use; 4B is Apache-2.0.\n\n```bash\ncurl -X POST https://api.bfl.ai/v1/flux-2-klein-4b -H \"x-key: $BFL_API_KEY\" -H \"Content-Type: application/json\" -d '{\"prompt\":\"minimal poster, the word KLEIN in bold red\"}'\n```\nLocal: `diffusers` with `black-forest-labs/FLUX.2-klein-4B`.\n\nSources: https://docs.bfl.ai/flux_2/flux2_overview , https://docs.bfl.ai/quick_start/pricing , https://huggingface.co/black-forest-labs","page_url":"https://postcutoff.com/m/flux-2-klein/","standing":{"kind":"image generation","newer_count":21,"newer":[{"id":"gpt-image-2-6-flare","name":"GPT Image 2.6 Flare","org":"OpenAI","released":"2026-11-04","page_url":"https://postcutoff.com/m/gpt-image-2-6-flare/"},{"id":"gpt-image-2-6-sunburst","name":"GPT Image 2.6 Sunburst","org":"OpenAI","released":"2026-11-04","page_url":"https://postcutoff.com/m/gpt-image-2-6-sunburst/"},{"id":"moss-image","name":"MOSS-Image","org":"MOSI / OpenMOSS","released":"2026-10-16","page_url":"https://postcutoff.com/m/moss-image/"},{"id":"flux-3-image-klein","name":"FLUX 3 Image Klein","org":"Black Forest Labs","released":"2026-10-15","page_url":"https://postcutoff.com/m/flux-3-image-klein/"},{"id":"krea-3","name":"Krea 3 (Fast / High / Ultra modes)","org":"Krea","released":"2026-10-15","page_url":"https://postcutoff.com/m/krea-3/"}],"before":{"id":"flux-2-max","name":"FLUX.2 [max]","org":"Black Forest Labs","released":"2025-12","page_url":"https://postcutoff.com/m/flux-2-max/"},"after":{"id":"flux-3-image-klein","name":"FLUX 3 Image Klein","org":"Black Forest Labs","released":"2026-10-15","page_url":"https://postcutoff.com/m/flux-3-image-klein/"},"weights":"public","licence":"apache-2.0 (4B); FLUX Non-Commercial License (9B)","licence_permissive":false,"summary":"Weights are public. Licence: apache-2.0; FLUX Non-Commercial License. See the licence for commercial terms."}}