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StepFun's Step 5 Preview lands on OpenRouter

1 report1 sourceupdated 2 hours ago

What happened

AI digest

On October 9, 2026 at 00:20, Hacker News reported that StepFun's Step 5 Preview is now listed on OpenRouter. The report says the model uses a sparse MoE architecture with 600B total parameters, 27B active parameters and a 1,000,000 token context window. The listing on OpenRouter is the known development, with the architecture, parameter counts and context window disclosed alongside it.

Written by AI from the coverage · updated 47 minutes ago

LatestOct 9 00:20

Step 5 Preview is listed on OpenRouter with a 1 million token context window.

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Oct 9

00:20
Hacker News front page
Step 5 Preview, a 1M-context MoE from StepFun, shows up on OpenRouter
阶跃星辰的 Step 5 Preview 已上架 OpenRouter，采用稀疏 MoE 架构，拥有 27B 激活参数、600B 总参数和 1,000,000 token 上下文窗口。

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