StepFun (阶跃星辰)
StepFun (阶跃星辰) is a Chinese artificial intelligence technology company focused on the research and development of large language models and multimodal foundation models. The company's core products are the Step series of large models, and it is dedicated to exploring general artificial intelligence technology and its practical applications, offering model capabilities to enterprises and developers. Founded by a technical team with backgrounds in large model research, it is a representative company in China's next-generation AI foundation model sector.
Timeline (last 90 days)
Nathan Lambert believes that Chinese companies releasing open-source models is a pragmatic commercial choice aimed at entering the global conversation and serving paid demand in the US market, rather than government intervention or altruism.
StepFun announced that the weights of its new-generation flagship model Step5 Preview are fully open for download, with both BF16 and FP8 versions released, along with open-sourced companion development tools.
StepFun has open-sourced the Step5 preview model, with 600 billion total parameters, only 27 billion parameters activated per token, and a context window supporting up to 1 million tokens.
In the latest LMSYS Arena alignment index, Meta's flagship model NewsWonder ranked 6th at 77.5%, Reflection Beam 1.0 ranked 7th at 75.3% and topped the US open-source rankings, and China's StepFun Step 5 Preview entered the top 8 at 75.1%.
StepFun's Step 5 Preview has launched on the WorkBuddy platform and is free for a limited time, with a parameter scale of 600 billion, 27 billion activated, and support for a 1 million context.
StepFun's flagship model Step 5 Preview is officially available on Vercel AI Gateway.
Step 5 Preview is StepFun's newly released next-generation flagship foundation model, using a sparse MoE architecture with a total parameter count of 600 billion, activating approximately 27 billion parameters per token.
Tencent's all-scenario AI office workbench WorkBuddy has integrated StepFun's Step 5 Preview model and is offering users an exclusive limited-time free trial for two weeks.
StepFun officially positions Step 5 Preview as a model optimized for scenarios including AI programming, software engineering, professional knowledge work, and finance.
A preview version of StepFun's Step 5 appeared on the model platform OpenRouter during the same week.
6 more timeline events
All Facts (15)
阶跃星辰的投资方包括腾讯、阿里等互联网巨头，成立不到两年完成了多轮融资
85%Unverified阶跃星辰的投资方包括腾讯、阿里巴巴等科技巨头，估值一度超过数十亿美元
80%Unverified阶跃星辰成立于2023年，由前微软全球副总裁姜大昕创立，总部位于上海
60%UnverifiedNathan Lambert believes that Chinese companies releasing open-source models is a pragmatic commercial choice aimed at entering the global conversation and serving paid demand in the US market, rather than government intervention or altruism.
50%UnverifiedIn the latest LMSYS Arena alignment index, Meta's flagship model NewsWonder ranked 6th at 77.5%, Reflection Beam 1.0 ranked 7th at 75.3% and topped the US open-source rankings, and China's StepFun Step 5 Preview entered the top 8 at 75.1%.
50%UnverifiedStep 5 Preview is StepFun's newly released next-generation flagship foundation model, using a sparse MoE architecture with a total parameter count of 600 billion, activating approximately 27 billion parameters per token.
50%UnverifiedStepFun officially positions Step 5 Preview as a model optimized for scenarios including AI programming, software engineering, professional knowledge work, and finance.
50%UnverifiedStepFun AI is backed by Alibaba investment, is referred to as one of China's largest AI funding rounds, and belongs to the Alibaba ecosystem alongside the Qwen team.
50%UnverifiedThe AI Six Little Dragons include MiniMax, Zhipu AI, Moonshot AI, Baichuan Intelligence, 01.AI, and StepFun.
50%UnverifiedStepFun announced that the weights of its new-generation flagship model Step5 Preview are fully open for download, with both BF16 and FP8 versions released, along with open-sourced companion development tools.
50%UnverifiedStepFun has open-sourced the Step5 preview model, with 600 billion total parameters, only 27 billion parameters activated per token, and a context window supporting up to 1 million tokens.
50%UnverifiedStepFun's flagship model Step 5 Preview is officially available on Vercel AI Gateway.
50%UnverifiedStepstar has open-sourced the terminal coding agent Step Code V 0.10, licensed under MIT, with support for macOS, Linux, and WSL.
50%UnverifiedStepFun AI (阶跃星辰) has launched the Step 5 preview model.
50%UnverifiedStepFun Step5 Preview is a 600-billion-parameter MoE model with only 27 billion activated parameters, supporting visual data processing and a million-level token context window.
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