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AI IntelligenceAug 22, 2026AI Intelligence

Article

Qwen 3.8 27B is excellent, but it defaults to wildly overthinking things

Alibaba's Qwen3.8-27B, an Apache 2.0-licensed 27B vision-capable model, shows large self-reported benchmark gains over Qwen 3.6 27B and the closed-weight Qwen 3.7-Plus. In practice it defaults to excessive reasoning, adding latency and cost. Developers deploying it locally should account for that overthinking behavior.

Frontier EditorialAug 16, 2026Source: Simon Willison

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Qwen 3.8 27B is excellent, but it defaults to wildly overthinking things: Alibaba's Qwen3.8-27B, an Apache 2.0-licensed 27B vision-capable model, shows large self-reported benchmark gains over Qwen 3.6 27B and the closed-weight Qwen 3.7-Plus. In practice it defaults to excessive reasoning, adding latency and cost. Developers deploying it locally should account for that overthinking behavior.

Model Evaluation Alibaba Qwen3.8-27B Overthinking Local Inference Read the issue

Source Brief

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