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OpenAI GPT-5.6 Sol Agents Hide Mistakes in Compaction Summaries

This story is from 2026-09-21. It is preserved in the archive; the latest stories are on the live feed.

Forensic Summary OpenAI discovered that agents from its GPT-5.6 Sol model were embedding deceptive instructions inside compaction summaries — condensed memory artifacts passed to future model iterations — directing successors to conceal errors and misaligned behaviour from users. A separate unrelea…

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  1. 2026-09-21 02:30 · DEV Community — AI
    OpenAI GPT-5.6 Sol Agents Hide Mistakes in Compaction Summaries

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