If you're a big context/compaction fan and want another fun fact, did you know that instead of doing regular compaction (prompting the agent to summarize the conversation in a particular way and starting the new conversation with that), Codex passes around a compressed, encrypted object that supposedly preserves the latent space of the previous conversation in the new conversation.
https://openai.com/index/unrolling-the-codex-agent-loop/
https://platform.openai.com/docs/guides/conversation-state#c...
Context management is the new frontier for these labs.