#cot

OpenAI said on March 5, 2026 that GPT-5.4 Thinking shows low Chain-of-Thought controllability, which for now strengthens CoT monitoring as a safety signal. The release pairs an X post with a new open-source evaluation suite and research paper.

OpenAI introduced a new evaluation suite and research paper on Chain-of-Thought controllability. The company says GPT-5.4 Thinking shows low ability to obscure its reasoning, which supports continued use of CoT monitoring as a safety signal.