Step 3.5 Flash

stepfun/step-3.5-flash

StepFun flash lane for quick multimodal reasoning and coding assistance

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Context window: 256K
Input: Text
Output: Text
Released: 2026-01-29

Max output: 256K
Knowledge cutoff: 2025-01
Model parameters: 199B
Active parameters: 11B
Weights: Open
License: apache-2.0
Capabilities: Open weight, Reasoning, Temperature, Tool call

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Performance

Overall capability

43.9/100

Coding: —
Reasoning: 44.8
Professional work: —
Knowledge & language: 40.8


Humanity’s Last ExamStep 3.5 Flash	Reasoning	Artificial Analysis	2026-11-05
AA-LCRStep 3.5 Flash	Knowledge & language	Artificial Analysis	2026-11-05
IFBench（Artificial Analysis）Step 3.5 Flash	Knowledge & language	Artificial Analysis	2026-11-05
BullshitBench v2	Knowledge & language	BullshitBench	2026-11-05
CritPtStep 3.5 Flash	Reasoning	Artificial Analysis	2026-11-05
Arena Text Overall	Blind	LMArena	2026-10-28
AA-OmniscienceStep 3.5 Flash	Knowledge & language	Artificial Analysis	2026-10-27
SWE-Bench Verified	Coding	SWE-bench	2026-08-05

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ModelRegistry · Catalog updated 2026-11-05