6 pages tagged
#openai
codex
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OpenAI's coding agent; "no manual code" experiment; compact() internals; Windows sandbox.
ryan-lopopolo
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OpenAI engineer; author of [[2026-04-27-harness-engineering-codex-agent-first]].
shunyu-yao
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OpenAI researcher; CALM → ReAct → tau-bench → *The Second Half*; named the utility problem.
2026-04-27-codex-context-compaction-investigation
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Kangwook Lee's prompt-injection probe extracting Codex's hidden compaction & handoff prompts.
2026-04-27-harness-engineering-codex-agent-first
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Ryan Lopopolo / OpenAI Codex's "no manual code" 5-month, 1M-LoC, 1500-PR experiment.
2026-07-12-codex-windows-sandbox-engineering
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OpenAI's Codex Windows sandbox: rejected primitives → unelevated prototype → elevated design.
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