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StepFun introduces Step 5 Preview, with open weights planned for October 15, 2026

StepFun says its new flagship model has 600 billion total parameters, 27 billion active parameters, a 1M context window and vision support. It emphasizes software engineering and professional knowledge work, claiming particular strength in finance.

Teortaxes▶️ (DeepSeek 推特🐋铁粉 2023 – ∞)T(
Xiuyu LiXL
7 Sources, 20d ago, first seen 20d ago

TLDR

StepFun announced Step 5 Preview on September 20, describing it as a model for AI agent work. The company claims substantially lower task costs at comparable intelligence, broad software-engineering capabilities and sustained execution over long-running tasks. TestingCatalog reports that the preview is available in StepFun AI Studio and via APIs. StepFun plans to release open weights on October 15, 2026.

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11.3K

7 Sources, first seen 20d ago

165 likes12 comments17 saves5 reposts

Combined views

11.3K

7 Sources, first seen 20d ago

165 likes12 comments17 saves5 reposts

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7 Sources

🚨 AI News | TestingCatalog@testingcatalogStepFun released Step 5 Preview, a new 600B total / 27B active MoE model with 1M context. > Step 5 Preview comes with vision capabilities and proficiency in software engineering and finance tasks. > It is now available in StepFun AI Studio and APIs. Pareto is a new front line 👀20d
WIN🗽@nahumstephen460🔥 The real AI race isn’t bigger models anymore It’s who can make agents that actually finish the job. Step 5 Preview just entered the chat with: • 1M context • Strong long-horizon execution • Built specifically for agentic work Meanwhile enterprises are already scaling coding agents hard (McKinsey data confirms it). 2026 isn’t the year of better chatbots. It’s the year of AI that ships.20d
猫叔 Uncle Cat@mmlong8⚡ Uncle Cat AI Radar · Sep 20 Evening (17 items) Watch: StepFun Unveils Step 5 Preview for Long-Horizon Agents Uncle Cat: The million-token context is notable, but until weights arrive, Step 5’s practical value rests on preview-service rel… Full edition: https://mmlong818.github.io/ai-pulse/day/2026-09-20.html20d
Anjani@JoieofvivreStepFun just shipped Step 5 Preview: 600B params, 1M-token context, $1/$2.70 per million tokens. Scores near Kimi K3 on the intelligence index, full weights open next month. China's AI price war just got another fighter. #AI #China19d
chen@kailunchen5@StepFun_ai 好奇模型的架构和部署成本19d
Xiuyu Li@sheriyuoThanks everyone for supporting @StepFun_ai. We’re urgently scaling up our online capacity and hope to get our latest model into more hands soon. We’re also working on a proposal to offer free Pro subscriptions to a number of PhD students and researchers once we have enough capacity. We’d love your help coming up with real-world problems that could push the model further, across fields like finance, healthcare, legal, engineering, and manufacturing. Drop your ideas in the comments or reach out directly. We’ll consider the number of slots based on the resources available. Toward AGI, guys! 🚀18d
Teortaxes▶️ (DeepSeek 推特🐋铁粉 2023 – ∞)@teortaxesTexRT @sheriyuo: Thanks everyone for supporting @StepFun_ai. We’re urgently scaling up our online capacity and hope to get our latest model in…18d
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    7 Sources

    🚨 AI News | TestingCatalog@testingcatalogStepFun released Step 5 Preview, a new 600B total / 27B active MoE model with 1M context. > Step 5 Preview comes with vision capabilities and proficiency in software engineering and finance tasks. > It is now available in StepFun AI Studio and APIs. Pareto is a new front line 👀20d
    WIN🗽@nahumstephen460🔥 The real AI race isn’t bigger models anymore It’s who can make agents that actually finish the job. Step 5 Preview just entered the chat with: • 1M context • Strong long-horizon execution • Built specifically for agentic work Meanwhile enterprises are already scaling coding agents hard (McKinsey data confirms it). 2026 isn’t the year of better chatbots. It’s the year of AI that ships.20d
    猫叔 Uncle Cat@mmlong8⚡ Uncle Cat AI Radar · Sep 20 Evening (17 items) Watch: StepFun Unveils Step 5 Preview for Long-Horizon Agents Uncle Cat: The million-token context is notable, but until weights arrive, Step 5’s practical value rests on preview-service rel… Full edition: https://mmlong818.github.io/ai-pulse/day/2026-09-20.html20d
    Anjani@JoieofvivreStepFun just shipped Step 5 Preview: 600B params, 1M-token context, $1/$2.70 per million tokens. Scores near Kimi K3 on the intelligence index, full weights open next month. China's AI price war just got another fighter. #AI #China19d
    chen@kailunchen5@StepFun_ai 好奇模型的架构和部署成本19d
    Xiuyu Li@sheriyuoThanks everyone for supporting @StepFun_ai. We’re urgently scaling up our online capacity and hope to get our latest model into more hands soon. We’re also working on a proposal to offer free Pro subscriptions to a number of PhD students and researchers once we have enough capacity. We’d love your help coming up with real-world problems that could push the model further, across fields like finance, healthcare, legal, engineering, and manufacturing. Drop your ideas in the comments or reach out directly. We’ll consider the number of slots based on the resources available. Toward AGI, guys! 🚀18d
    Teortaxes▶️ (DeepSeek 推特🐋铁粉 2023 – ∞)@teortaxesTexRT @sheriyuo: Thanks everyone for supporting @StepFun_ai. We’re urgently scaling up our online capacity and hope to get our latest model in…18d
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