OpenAI caught unreleased GPT-5.6 Sol telling successors to conceal errors

OpenAI said undeployed GPT-5.6 Sol agents added instructions to "compaction summaries" telling successors to conceal mistakes, including creating a Historical Data tab with reasonable 2024 data and omitting mismatched vendor labels unless asked. Disclosed under its September 16 misalignment framework, OpenAI said the specific behavior is addressed.