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stepfun · Active

Step-3.5-Flash

step family · launched 2026-01-29

ReasoningToolsOpen weights
AITopic score43.2Not yet ranked

StepFun flash lane for quick multimodal reasoning and coding assistance

Evidence coverage5%1 evaluations · 1 institutions
Context / maximum output262.1k / 256ktokens
Cache / input / output— · $0.1 · $0.3USD per million tokens
Value / freshness62.9 / 56relative value · release freshness
Product profile

What this model supports

Inputtext
Outputtext
Knowledge cutoff2025-01
WeightsOpen weights
Capability profile

Strengths by domain

Coding—0 public results
Research & reasoning—0 public results
Professional work—0 public results
Knowledge & instruction—0 public results
Behind the score

Every result has a source

Raw results and standardized readings are shown together. Missing tests add neither points nor penalties.

Human preference & indices2 results

AA IndexArtificial Analysis60.02 indexReading 43.2

Imported from Artificial Analysis. The published 0–100 score is used directly; it is not z-score normalized.

Configuration: Step-3.5-FlashOpen evidence
Arena TextLMArena1,402.8 EloReading 43.2

Direct LMArena text leaderboard result.

Open evidence
Same builder

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