WhichAI / Models / Step 3.7 Flash

Step 3.7 Flash

· verified October 14, 2026

public free open-weights api in Generator speed multilingual

Provider

Statuspublic

AA Intelligence Index19.5 (official, read October 14, 2026)

Released2026-05-28

Context window262K

Modalitiesn/a

API price $/1M (in / out)$0.2 / $1.15 (OpenRouter)

Speedn/a

AccessOpen weights · API

In one line

StepFun's fast open tier - part of the broad Chinese open-weight wave now taking ~45% of OpenRouter traffic.

Coding54

Reasoning52

Writing50

Agents & tools46

Category scores (0-100) are WhichAI blended ratings: public category leaderboards plus editorial judgment. Guidance, not official measurements.

Alternatives worth a look

Qwen3.5-35B-A3B (Alibaba) · AA 19.3API $0.15/$1 per 1M tokens on OpenRouter · open weights · listed February 25, 2026
LongCat 2.0 (Meituan) · AA 19.1API $0.3/$1.2 per 1M tokens on OpenRouter · open weights · listed July 20, 2026
Ling 3.0 Flash (Ant Group) · AA 20.1API $0.021/$0.063 per 1M tokens on OpenRouter · open weights · listed July 23, 2026

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Artificial Analysis Intelligence Index, official scale (the number published on artificialanalysis.ai), relayed by OpenRouter and refreshed automatically: last read October 14, 2026. 209 models carry a current official measurement. A value marked ~ is converted from an earlier snapshot because no current measurement is published; an unmeasured model is never ranked. Context, price, modality and listing dates come from the public OpenRouter model list (refreshed automatically on the live site; static copy retrieved October 3, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (the Ranking chapter and About > Methodology).