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StepFun: Step 3.5 Flash

stepfun/step-3.5-flash
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Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....

Modalities
In / Out Price
$0.10 / $0.30 per 1M
Context
262K
Released
Jan 29, 2026
Knowledge Cutoff
—

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