Step 5 Preview

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stepfun/step-5-preview

Step 5 Preview is StepFun’s preview model for coding and professional knowledge tasks. It accepts text, images and video, generates text, and supports a one-million-token context window with up to 64,000 output tokens.

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Context window: 1M
Input: Image · Text · Video
Output: Text
Released: 2026-09-20

Max output: 64K
Model parameters: 600B
Active parameters: 27B

Pricing

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Performance

Overall capability

56.5/100

Coding: 58.8
Reasoning: 49.7
Professional work: 58.3
Knowledge & language: 58.9


Arena Agent Overall	Professional work	LMArena	2026-11-08
Humanity’s Last ExamStep 5 Preview	Reasoning	Artificial Analysis	2026-11-05
AutomationBench-AAStep 5 Preview	Professional work	Artificial Analysis	2026-11-05
AA-LCRStep 5 Preview	Knowledge & language	Artificial Analysis	2026-11-05
MysteryMechanism	Reasoning	Vals AI	2026-11-05
AA-OmniscienceStep 5 Preview	Knowledge & language	Artificial Analysis	2026-11-05
Terminal-Bench 4.0 (AA rerun)Step 5 Preview	Coding	Artificial Analysis	2026-11-05
Harvey Legal Agent Benchmark	Professional work	Vals AI / Harvey	2026-11-05

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ModelRegistry · Catalog updated 2026-11-10