TextImage + textVoice assistants

Step

StepFun MoE models built for fast, low-cost work: with 196 billion parameters, Step-3.5/3.7-Flash use about 11 billion per token. Compact Step3-VL-10B for images and voice Step-Audio 2 mini are available. The flagship Step 5 Preview (600B, 27B active, up to 1M-token context, text and images as input) is built for agents, programming and finance tasks.

Developer
StepFun, China
First release
Jul 2025
Latest release
Oct 2026
Sizes
8B to 600B
License
Commercial use with conditionsStep-3.5/3.7-Flash and earlier versions: Apache 2.0; Step 5 Preview: StepFun Model License 1.0, free, but above 20 million dollars of product revenue a month or 100 million users the "Powered by StepFun AI" notice is required, and some cases (for example, hardware manufacturers) need a separate agreement
Russian
Not supported
Ready-made builds
GGUF, AWQ, MLX (Apple)
Running
On your own serverNeeds a GPU
Industries
Software development, Customer support, Documents and accounting
Deploy on your server Hugging Face GitHub

What it does

  • High-load agents
  • Analysis of documents with diagrams and screenshots
  • Help for developers

Where it is used

Software developmentCustomer supportOperations departments

Hardware requirements

LaptopLaptop or regular PC, up to 8 GB of VRAM — smaller versions
no versions
1 GPUOne GPU with 16–80 GB — mid-size versions
fits
ClusterServer with several GPUs — flagship versions
fits

Versions

  1. Step 5 Preview 600B-A27B (FP8, BF16 и NVFP4)
  2. Step-3.7-Flash
  3. Step-3.5-Flash
  4. Step3-VL-10B
  5. Step-Audio 2 mini 8B
  6. Step3

How to run it

On your own serverWeights are downloaded from Hugging Face and served with vLLM (load and API) or llama.cpp (modest hardware). The model then runs in a closed network with no per-request fees.Hugging Face
How much hardware you needCalculate the VRAM for the model size, context length and number of concurrent requests.Open the hardware calculator

I can set this up end to end: pick the model size, deploy it on your server and connect it to your systems. Quantization compresses a model so it takes less video memory and runs on more modest hardware. Answers change slightly, so quality is checked on your own examples.

Frequently asked questions

Can Step be used in a commercial project?

With conditions. License: Step-3.5/3.7-Flash and earlier versions: Apache 2.0; Step 5 Preview: StepFun Model License 1.0, free, but above 20 million dollars of product revenue a month or 100 million users the "Powered by StepFun AI" notice is required, and some cases (for example, hardware manufacturers) need a separate agreement. Restrictions vary — region, company revenue, attribution requirements. Have a lawyer check the terms before a commercial launch.

What hardware does Step need?

At minimum: One GPU with 16–80 GB — mid-size versions. Without a GPU the model is not practical. You can calculate the exact VRAM for your model size and context in the hardware calculator.

Does Step support Russian?

No. The developer documentation lists the supported languages and Russian is not among them.

Where can I download Step and what does it cost?

The Step weights are open and free to download. You only pay for the hardware it runs on and for the setup. Source links are at the bottom of this page.

How I deploy it for clients

  1. SelectionI pick the model size for your task and hardware and test it on your examples.
  2. DeploymentI deploy it on your server or in a closed network and provide an API.
  3. Fine-tuningI fine-tune it on your data (LoRA) or connect a knowledge base — whichever is cheaper for the task.
  4. IntegrationI connect it to your CRM, ERP, bot, website or team chat and set up monitoring.

Similar models

TextMiniMaxMiniMax · ChinaCommercial use with conditions

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DetailsTextMiMoXiaomi · ChinaCommercial use allowed

Xiaomi models for reasoning and agents: from the compact MiMo-7B to MiMo-V2.6-Pro with 1.02 trillion parameters. The larger versions understand text, images, video and audio, with a 1M token context. Languages: English and Chinese.

DetailsTextLongCatMeituan · ChinaCommercial use allowed

Models from Meituan, China's largest delivery service. LongCat-Flash adjusts compute to query complexity; LongCat-2.0 has 1.6 trillion parameters under MIT. Omni models (Flash-Omni, Next) and AudioDiT speech synthesis too.

Details

Source: huggingface.co/stepfun-ai/Step-3.7-Flash. Data checked against the model card on 22 Sep 2026. Have a lawyer review the license before commercial launch.