Greenblatt: OpenAI blocking reasoning=None hurts AI monitorability research
RyanGreenblatt · x · 2026-09-06
Ryan Greenblatt (Redwood Research) argues OpenAI's move to remove the reasoning=None option from its public API makes monitorability research harder, not safer: models can still reason latently without verbalizing, and the higher-capability reasoning-on case is the more concerning one. He suspects the real motives are jailbreak robustness or anti-distillation, notes Anthropic also disallows disabling CoT for Fable, and proposes a low-bar researcher access program to restore no-CoT experimentation.
Related event: OpenAI's removal of reasoning=None sparks researcher misjudgment(2 posts)→
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