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Featherless serves StepFun's open-weights Step 5 Preview at FP8

1 article1 sourcesince Oct 15Last article 2h ago ·

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Featherless now serves StepFun's open-weights Step 5 Preview, a 600B sparse mixture-of-experts model with 27B parameters active per token, at FP8 precision, according to StepFun's announcement on X. StepFun says the model matches Kimi K3 on the Artificial Analysis Intelligence Index and costs about one-sixth as much per task as Claude Opus 5.5, citing Artificial Analysis. Featherless describes the model as built for long-horizon agent work, including software engineering and finance.

Written by AI from the articles below · updated Oct 15, 11:45 AM ET

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Latest developmentOct 15, 11:30 AM ET
StepFun's Step 5 Preview is live on Featherless

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Oct 15
  1. StepFunOfficial
    StepFun's Step 5 Preview is live on Featherless

    AIStepFun's open-weights Step 5 Preview, a 600B sparse MoE model with 27B active per token, is now served at FP8 on Featherless. StepFun says it matches Kimi K3 on the Artificial Analysis Intelligence Index and costs about one-sixth as much per task as Claude Opus 5.5, per Artificial Analysis. Featherless describes the model as built for long-horizon agent work, including software engineering and finance.

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