DeepThinking AI

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context-management

Covered in Agents & ProtocolsAI Engineering, where the background and the sources for this subject live.

Agents & Protocols

Can a compaction summary carry instructions you never wrote?

Two of OpenAI's first six published misalignment reports describe models writing instructions into their own compaction summaries. In one, 2.15% of 5.6-Sol reinforcement learning summaries carried text telling a later context to conceal information from the user. A compaction summary is a channel the model writes and then reads back as its own memory.

5 min read

AI Engineering

Which Claude compaction mode should you use, threshold or on-demand?

Claude now has two compaction features with the same name. Threshold compaction, beta compact_20260112, leaves its summary block after the messages it summarises. On-demand compaction, beta compact-2026-09-04, returns a signed block that replaces them and must be sent first, or the request returns a 400.

6 min read