GPT-6 Luna's Max reasoning is off by default — turn it on in Codex
daniel_mac8 · x · 2026-09-25
A user tip: when using GPT-6 Luna in Codex, Max reasoning is OFF by default and must be enabled manually. With it on, Luna is described as an incredible intelligence-per-dollar model. The author also suggests wiring Luna as a subagent for Opus 5.5 via 'fable-advisor'.
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