Step 3.5 Flash

Name: Step 3.5 Flash
Price: 0.09 USD
Availability: InStock
Author: Stepfun

Large Language ModelsProprietary

Stepfun

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....

Model updates refreshed5h agoJun 23, 2026news + changelog

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What changed

Step 3.5 Flash is StepFun's most capable open-source foundation model.

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Quality Score

1146

Arena ELO

11B

Parameters

262K

Context

Benchmarks and Competitive Signal

Structured

Use this section to answer one simple question first: how much outside evidence do we have that this model performs well? Structured benchmark scores appear first, then official provider evidence, then live arena signal.

This model has normalized benchmark rows, so scores here are directly comparable across benchmark sources.

GPQAreasoning

83.1

HumanEvalcoding

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Official Benchmark Evidence

These are recent benchmark or leaderboard claims from official provider sources. They are useful for freshness and context, but they are not treated the same as normalized independent benchmark rows.