Great to see Step 5 Preview live on @FeatherlessAI!
Frontier-level intelligence, competitive cost efficiency, and easier access for developers.
StepFun's Step 5 Preview is live on Featherless
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StepFun'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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@StepFun_ai
Step 5 Preview is here. @StepFun_ai's new open-weights model sets a new Pareto frontier, matching Kimi K3 on the @ArtificialAnlys Intelligence Index! It’s built for long-horizon agent work, with frontier-level results on software engineering and professional knowledge work, especially finance. - 600B sparse MoE, 27B active per token - ~1/6 the cost per task of Claude Opus 5.5, per Artificial Analysis Now on Featherless, served at FP8. https://featherless.ai/model-pages/step-5-preview
Source: StepFun · x.comPublished · added here