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StepFun: AI models, benchmarks & research

StepFun (阶跃星辰) is a Chinese artificial intelligence company focused on developing large language models and multimodal AI systems.

Open-weightMultimodal
Model
Step 3.7 FlashMultimodal
Step-3.5-Flash
Step3-VL-10BMultimodal
At a glance

StepFunmodels, benchmarks & research

Key facts about StepFun's portfolio of 3 AI models — sourced from public benchmarks, provider APIs, and model releases.

Models
3 models across 0 families
Portfolio
3 language models
Licensing
3 open-weight, 0 proprietary
Benchmarks
Evaluated on 16 benchmarks
Cheapest model
Step-3.5-Flash at $0.10 per 1M input tokens
Active since
Shipping models since January 2026, latest release June 2026

FAQ

Common questions about StepFun.

What is StepFun?

StepFun is an AI research organization that develops large language models and other AI systems. They have released 3 models across 0 model families.

How many AI models has StepFun released?

StepFun has released 3 AI models tracked on LLM Stats. See the Models tab for the full catalog with technical specifications, benchmark scores, and pricing.

Does StepFun release open-weight models?

Yes. 3 of StepFun's 3 models are released under open-weight licenses. Check the Models tab for per-model license details.

How do StepFun's models perform on benchmarks?

StepFun's models have been evaluated on 16 benchmarks. Their top-performing model is Step-3.5-Flash on AIME 2025 with a score of 1.0. See the Benchmarks tab for the full breakdown.

What does it cost to use StepFun's models?

StepFun's most affordable model is Step-3.5-Flash with input pricing from $0.10 per 1M tokens via commercial API providers. 2 of their models have public pricing. See the Pricing tab for the full comparison.

When did StepFun start releasing AI models?

StepFun has been releasing AI models since January 2026. Their latest release was in June 2026. See the Timeline tab for the full release history.

How can I use StepFun's models?

Visit https://stepfun.com for official documentation and API access. Many of StepFun's models are also available through third-party API providers — check the Pricing tab to compare pricing across providers.