Step-3.5-Flash is a multimodal language model from StepFun AI that supports text, image inputs, and tool/function calling. It features a sophisticated Jinja chat template for handling system prompts, tools in JSON schema format, and mixed content types including image patches. The model is available on Hugging Face for use with Transformers or compatible inference engines.
Step 3.5 Flash is a Foundation models & chat product. It focuses on accessing a fast, multimodal LLM with native tool use without building or hosting the model yourself. It is built as an open-source project for developers. Step 3.5 Flash is open source under the Apache-2.0 license. Step 3.5 Flash is available on the command line and API.
StepFun AI builds and maintains Step 3.5 Flash, and the product first shipped in 2026. Development happens publicly on GitHub with 2.1k stars. Key capabilities include Tool Calling, Multimodal Input, and Chat Template.
Latest indexed changes and source events
stepfun-ai/Step-3.5-Flash verified by the PulseGate indexer
Other apps tracked under the same category.
