StepFun
1 Tool · 29 Intel
StepFun is a Shanghai-based artificial intelligence company founded in April 2023 by former Microsoft employees, including Jiang Daxin, Zhu Yibo, and Jiao Binxing. The company builds large multimodal AI models, including its Step series, that process text, images, video, and audio, and it has been counted among China's leading 'AI Tiger' startups. It has raised funding from investors including Tencent and Qiming Venture Partners.
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Tools
Apache 2.0 conversational text generation model with 11B active parameters, servable via vLLM or SGLang.
Intel
StepFun opened beta access to Step-DeepResearch, a single agent research system that plans, verifies across sources and cites, backed by a 20M paper index. Reported 61.42% on research rubrics and 67.1% win/tie on ADR-Bench, with a technical report and GitHub release.
Step 3.5 Flash is a 196B sparse MoE activating 11B parameters per token, with 256K context, 100 to 300 tok/s throughput and agentic scores of 74.4% SWE-bench Verified and 51.0% Terminal-Bench 2.0. Open weights on Hugging Face, plus OpenRouter and local deployment.
Step Image Edit 2 is a 3.5B model for text to image and instruction based editing, reported first on KRIS-Bench across overall, factual and conceptual categories. It renders Chinese and English text accurately, edits in 1.6 seconds and costs $0.003 per image.
StepFun published an official ClawHub plugin, so OpenClaw v3.28 and later can point at Step models through either the standard API or a Step Plan subscription, with both the Chinese and international endpoints supported.
StepFun open sourced CoPaRe, or Coordinated Parallel Reasoning, a test time compute method that scales parallel reasoning chains rather than a single longer trace. The headline claim is an 8B model beating GPT-5 Thinking on math, with the release on Hugging Face.