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

L4 · DeveloperModels & ReleasesSimon Willison's Blog· 8/16/2026

Developer-focused analysis of a new model's performance characteristics and practical runtime considerations for local deployment.

AI Summary

Qwen 3.8 27B is a new open-source vision-capable LLM that defaults to an 'xhigh' reasoning effort setting, causing extensive overthinking even for simple tasks.

Excerpt

Heees my review of Qwen 3.8 27B - I can't remember the last time I've had this much fun playing with a local model that runs on my own computers simonwillison.net/2026/Aug/16/...

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