GPT 5.6 Luna Quietly Adds an Ultra Effort Reasoning Tier, Users Notice
Top-Post7707 · reddit · 2026-09-17
A Reddit user noticed that GPT 5.6 Luna, which they normally run on Max effort for backend work and daily tasks, now shows a sudden 'Ultra effort' option. They are unsure whether it was recently added or always there, sparking discussion about unannounced reasoning-tier changes.
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