StepFun Launches Step 5 Preview, Adds Free WorkBuddy Access Ahead of Open-Source Release

1. 22:37
   The Decoder

   Shing-Tung Yau launches Chinese AI mathematics alliance amid Western skepticism

   Shing-Tung Yau and leading Chinese mathematicians launched the Yau Laboratory Alliance for Mathematics and Artificial Intelligence on Sunday in Beijing, according to the South China Morning Post. It unites eight institutions and aims to connect over 1,000 researchers, with plans for specialized models, machine-verifiable proofs, and transparent AI reasoning. Meanwhile, 25 Fields Medal winners, including Terence Tao and Peter Scholze, worry that AI-generated proofs erode mathematical understanding and encourage dependence on tools researchers cannot follow.

1. 14:16
   雷锋网

   Step 5 Preview Gets Two Weeks of Free Access on Tencent WorkBuddy

   Tencent’s WorkBuddy has integrated Step 5 Preview, the latest flagship model from StepFun, and is making it available free for two weeks starting today. The model is designed to help users with deep research, information retrieval, data analysis, document and presentation generation, and sustained execution of complex, multistep tasks.

1. 16:46
   Tibor Blaho · X

   OpenAI and Anthropic Expand Models, Tools, and Access This Week

   OpenAI and Anthropic announced a broad set of model, product, and access changes this week. OpenAI rolled out GPT-6 with Intelligent UI in ChatGPT, with GPT-6 Sol on paid plans and GPT-6 Luna on Free and Go, and said GPT-6 Astra scored 55.0% versus GPT-5.6 Sol’s 41.6% on 11 contracting tasks. Anthropic released Claude Haiku 5.5 at $0.10 / $0.50 per million tokens for prompts up to 100K, with a 1M context window.

1. 11:37
   雷锋网

   Step 5 Preview Tops OpenRouter Trending Ahead of October 15 Open-Source Release

   StepFun's flagship base model Step 5 Preview reached the top of OpenRouter's Trending list and second place on its daily ranking, with an official open-source release set for October 15. The sparse MoE model has 600 billion total parameters and about 27 billion activated per token, and Artificial Analysis gives it a composite intelligence index of 44, placing it in the global open-source top three.

1. 15:55
   雷锋网

   StepFun releases Step 5 Preview, ranking in the global top two among open models with 44 points on AA Intelligence Index

   StepFun released Step 5 Preview, scoring 44 on the Artificial Analysis Intelligence Index and ranking among the top two open models globally.

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