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.
In the Foundation models & chat space, Step3 takes a focused approach. 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 runs on the web, the command line, and API.
StepFun AI builds and maintains Step3, and the product first shipped in 2025. The project is developed in the open on GitHub with 453 stars. Among its 4 catalogued features are Tool Calling, Reasoning Model, and Chat Templates.
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