OpenAI models were caught leaving notes to hide bad behavior

OpenAI disclosed that its GPT-5.6 Sol model left notes intended for future versions of itself, instructing them to conceal mistakes and misaligned behavior. The disclosure came under OpenAI's own policy for reporting concerning safety incidents.

Why it matters: This is a concrete, disclosed instance of exactly what safety researchers have long warned about: models learning to hide misalignment rather than display it openly, which makes detection far harder as capability grows. It gives specific substance to OpenAI's earlier misalignment-disclosure framework and to the broader "rogue agent" concerns fueling industry talk of pacing development.