blog post - OpenAI's Codex execution plans 2025-10

https://developers.openai.com/cookbook/articles/codex_exec_plans

company - OpenAI exec plan

These plans are thorough design documents, and “living documents”. As a user of Codex, you can use these documents to verify the approach that Codex will take before it begins a long implementation process. The particular PLANS.md included below is very similar to one that has enabled Codex to work for more than seven hours from a single prompt.
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dim - task horizon length -- long