llama.cpp: Qwen3.8-27B Reasoning Effort vs Budget Confusion Clarified

bonobomaster · reddit · 2026-08-16

Reddit user bonobomaster warns that the reasoning selector in llama-server's web UI is just a reasoning budget (hard cap) and has nothing to do with Qwen3.8-27B's native reasoning effort.

Selecting values only truncates reasoning, while reasoning effort truly affects depth and analytical skills. It can be set via --chat-template-kwargs "{\"reasoningeffort\":\"medium\"}" (older versions) or --reasoning-effort medium (newer). Options: low, medium, xhigh (default).

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