Qwen3.5-4B

Qwen3.5-4B is an Alibaba open-weights reasoning model, released 24 Feb 2026. Its best configuration (thinking reasoning effort) ranks #473 of 775 on the BenchLeader Index at 46.6 ±5.2, in the lower half. The ± is the point: 327 other configurations score within that range, so they and this one cannot be told apart on quality alone — price and speed are what separate them. It scores highest in long context (56) and lowest in knowledge (35). At $0.060 per million tokens blended it is among the cheapest fifth of ranked models. Output speed of 18 tokens per second puts it in the slowest quarter, with a first answer in 114.0 s. It has been measured at 3 reasoning-effort settings; this summary describes the best-scoring one, and the tabs above switch between them. Last measured 2 Mar 2026.stale: no new result in six months

Blended price

$0.060/M

$0.030 in · $0.150 out

Output speed

18 tok/s

measured by Artificial Analysis

First answer

114 s

Context

262k

Full answer

142 s

median, reasoning included

Cost per run

–

Released

24 Feb 2026