Step3
Step3 is an open foundation model developed by StepFun AI. It features sophisticated tool-calling support, custom chat templates, and strong reasoning abilities. Available on Hugging Face with pip and Docker support, it is intended for developers who want to run or fine-tune a capable language model locally or in their own infrastructure.
Overview
4 featuresStep3 is a Reasoning project. It focuses on providing powerful open-source LLMs with native tool use and reasoning for developers building AI applications. Step3 is an open-source project aimed at AI developers and researchers. The project is open source (Apache-2.0). It ships for the web, the command line, and API.
It is developed by StepFun AI (China), and it first shipped in 2025. Development happens publicly on GitHub with 453 stars. Among its 4 catalogued features are Tool Calling, Reasoning Model, and Chat Templates.
Summary written by a language model from the project’s public pages.
- Tool Calling
- Reasoning Model
- Chat Templates
- Large Context
Built with & integrations
- AWS
- x-amz-cf-id header · x-amz-cf-pop header · via header
- local_oss
- bvllm in the HTML · transformers in the HTML
Trust & compliance
Indexing history
1What PulseGate has recorded for this listing
- Indexed20 Jul · 09:27 UTCstepfun-ai/step3 verified via Hugging Face EnumeratorSource: Hugging Face Enumerator · Open
Frequently asked questions about Step3
- What does Step3 do?
- Step3 focuses on providing powerful open-source LLMs with native tool use and reasoning for developers building AI applications. It is catalogued under Reasoning on PulseGate.
- Who should use Step3?
- Step3 is an open-source project built for AI developers and researchers.
- Does Step3 have a free plan?
- Yes — Step3 is open source under the Apache-2.0 license and free to use.
- What platforms does Step3 run on?
- Step3 runs on the web, the command line, and API.
- Is Step3 still active?
- Unverified. Step3 has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
- What projects are similar to Step3?
- Similar projects tracked by PulseGate include Step 3.5 Flash, Step 3.7 Flash, and Step3 VL 10B.Step 3.5 FlashStep 3.7 FlashStep3 VL 10B
- Who develops Step3?
- Step3 is developed by StepFun AI, based in China.
- When did Step3 launch?
- Step3 first shipped in 2025.
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