step-5-preview
step-5-preview is StepFun's flagship model for agentic work. Contribute to stepfun-ai/Step-5-Preview development by creating an account on GitHub.. It is ranked #720 on the Dev Radar, in AI dev tools, first seen 15 days ago and shared in 11 posts (143.9k views).
GitHub - stepfun-ai/Step-5-Preview: StepFun's flagship model for agentic work · GitHub Skip to content Navigation Menu Sign in Search / Sign in Sign up Appearance settings You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Reload to refresh your session. You switched accounts on another tab or window. Reload to refresh your session. Dismiss alert {{ message }} Repository navigation Step-5-Preview Public Notifications You must be signed in to change notification settings Fork 0 ( 0 ) Star 75 ( 75 ) You must be signed in to star a repository About StepFun's flagship model for…
What people said about step-5-preview on X
Step 5 Preview is now open weights. BF16 and FP8 weights are live on Hugging Face and ModelScope, together with our technical blog. • Sparse MoE: 600B total, 27B active per token • 1M-token context window • Native text and vision input • Built for long-horizon agentic work: coding, software engineering, professional…
— @StepFun_ai, 15 days ago · 973 likes · see the post
Congrats to StepFun on Step 5 Preview 🙌 Their largest open weights release. The 600B MoE model is built to handle agent tasks lasting up to 24 hours. The model runs at nearly 8K tokens/sec/GPU on NVIDIA GB300 using NVFP4. NVP4 checkpoint: https://huggingface.co/stepfun-ai/Step-5-Preview-NVFP4 Deploy with…
— @NVIDIAAI, 15 days ago · 412 likes · see the post
it doesn't even include Opus 5.5 and it looks pretty brutal for chinese models (and Fable 5.5 and the next Astra are both ready too)
— @scaling01, 14 days ago · 234 likes · see the post
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step-5-preview in numbers
- Rank on the Dev Radar: #720 of 8798
- Shared in 11 posts by 11 accounts: @StepFun_ai, @NVIDIAAI, @scaling01, @MiaAI_lab
- 143.9k views on those posts
- First seen 15 days ago, last shared 11 days ago
- Pricing seen by AGK Intelligence: open source
- Market: AI dev tools
FAQ
What is step-5-preview?
StepFun's flagship model for agentic work. Contribute to stepfun-ai/Step-5-Preview development by creating an account on GitHub. It was first shared on X 15 days ago and is ranked #720 on the Dev Radar.
Is step-5-preview free?
It is open source.
Who shared step-5-preview?
11 accounts on X, including @StepFun_ai, @NVIDIAAI, @scaling01, in 11 posts totalling 143.9k views.
Every post is read and classified by AGK Intelligence: what it is, which market it belongs to, and whether the link is a real tool. 31.2k posts from 5k X accounts over the last 21 days, 8.8k tools, 12 markets. New posts are collected several times an hour and the full ranking is recomputed every hour — last update 2026-10-30 20:27 UTC. Full method.