Step 3.5 Flash
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.
Overview
4 featuresStep 3.5 Flash is a Multimodal & vision project. 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. The project is open source (Apache-2.0). It ships for the command line and API.
Behind Step 3.5 Flash is StepFun AI, based in China, and it first shipped in 2026. The project is developed in the open on GitHub with 2.1k stars. Among its 4 catalogued features are Tool Calling, Multimodal Input, and Chat Template.
Summary written by a language model from the project’s public pages.
- Tool Calling
- Multimodal Input
- Chat Template
- Image Patch Tokens
Built with & integrations
- AWS
- x-amz-cf-id header · x-amz-cf-pop header · via header
- multiple
- bopenrouter in the HTML
- local_oss
- bollama in the HTML · bllama in the HTML · bvllm in the HTML
Trust & compliance
Indexing history
1What PulseGate has recorded for this listing
- Indexed20 Jul · 09:27 UTCstepfun-ai/Step-3.5-Flash verified via Hugging Face EnumeratorSource: Hugging Face Enumerator · Open
Frequently asked questions about Step 3.5 Flash
- What is Step 3.5 Flash?
- Step 3.5 Flash focuses on accessing a fast, multimodal LLM with native tool use without building or hosting the model yourself. It is catalogued under Multimodal & vision on PulseGate.
- Who should use Step 3.5 Flash?
- Step 3.5 Flash is an open-source project built for developers.
- Does Step 3.5 Flash have a free plan?
- Yes — Step 3.5 Flash is open source under the Apache-2.0 license and free to use.
- What platforms does Step 3.5 Flash run on?
- Step 3.5 Flash runs on the command line and API.
- Is Step 3.5 Flash still maintained?
- Unverified. Step 3.5 Flash 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 are alternatives to Step 3.5 Flash?
- Similar projects tracked by PulseGate include Step 3.7 Flash, Step 3.7 Flash, and Step3.Step 3.7 FlashStep 3.7 FlashStep3
- Who develops Step 3.5 Flash?
- Step 3.5 Flash is developed by StepFun AI, based in China.
- When did Step 3.5 Flash launch?
- Step 3.5 Flash first shipped in 2026.
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