Step 3.5 Flash 2603
Step 3.5 Flash 2603 is developed by StepFun, released 2026-04-02.
Model ID: step-3.5-flash-2603
China-region price; check the official site; Single public source; verify on the official site
Input price
$0.1046 / 1M tok
Output price
$0.3138 / 1M tok
Blended price
$0.1569 / 1M tok
Epoch Capabilities Index (ECI)
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Epoch Mock AIME accuracy
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Epoch FrontierMath (T1–3) accuracy
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Arena text rating
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Arena coding rating (human preference votes, not task accuracy)
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Arena math rating
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Arena WebDev rating
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Official list price from StepFun, as recorded by
models.dev.
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See all of StepFun's models on its provider page, or browse the full model directory. Full source licenses and sync dates: /data-sources/.