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Step 3.7 Flash

Hugging Face (open weights) Open weights

The catch: Needs a multi-GPU server, and the card does not state the context length (262,144 comes from config.json).

AccessOpen weights
Free limitsFree to download and self-host; you pay only for your own compute. 198B total (196B language backbone + 1.8B vision encoder), about 11B active (MoE); image input; the config sets a 262,144-token context. Needs multi-GPU. Released 23 May 2026.
Modalitytext, code, image
Credit cardNot required
Commercial useAllowed
Trains on your data–
Licence or termsApache-2.0
Context window262,144 tokens
Model idstepfun-ai/Step-3.7-Flash
Base URL–
Last checked8 Oct 2026

How to use Step 3.7 Flash

Download the weights and serve them yourself; the quickstart below shows one way. Licence: Apache-2.0.

Quickstart 
vllm serve stepfun-ai/Step-3.7-Flash --tensor-parallel-size 8 --enable-expert-parallel --disable-cascade-attn --reasoning-parser step3p5 --enable-auto-tool-choice --tool-call-parser step3p5 --trust-remote-code
Paste into Claude Code 
I want to run the open-weight model "Step 3.7 Flash" (stepfun-ai/Step-3.7-Flash) for my project.
Please:
1. Check the model card and tell me the hardware it needs and the simplest way to serve it (vLLM, SGLang, Ollama or a hosted endpoint).
2. Give me a minimal working setup and a test request.
3. Tell me the licence terms for commercial use.
4. If a cheaper or smaller variant would do the job, mention it.
Provider docs Get the weightsCompare all 507 free options

Before you ship on it

  • Needs a multi-GPU server, and the card does not state the context length (262,144 comes from config.json).
  • Apache-2.0 (licence tag on the HF repo): use, modify, distribute and sell, including commercially; keep the licence and notices when you redistribute.
  • Free to run means you pay for the GPUs, the serving stack and the on-call.

Questions

Is Step 3.7 Flash free?

Yes. Open weights offers it as open weights, with these limits: Self-host free · Apache-2.0. No credit card is needed.

Can I use Step 3.7 Flash commercially?

Yes, under Apache-2.0. Check the current terms before you ship.

How do I start with Step 3.7 Flash?

Download the weights and serve them yourself; the quickstart below shows one way. Licence: Apache-2.0.

Source: huggingface.co/stepfun-ai/Step-3.7-Flash, checked 8 Oct 2026.