https://planlimits.app/tools/openai-codex/Dated AI coding plan and usage-limit changes, each with a vendor source. By PlanLimits.enhttps://planlimits.app/changelog/#2026-10-14-openai-codexplanlimits-2026-10-14-openai-codex-GPT-5.5 retired from Codex with ChatGPT Wed, 14 Oct 2026 12:00:00 GMTGPT-5.5 retires from Codex with ChatGPT sign-in at noon PDT (19:00 UTC). API-key sessions unaffected. Source: https://learn.chatgpt.com/docs/pricing (checked 2026-10-19)https://planlimits.app/changelog/#2026-08-25-openai-codexplanlimits-2026-08-25-openai-codex-5-hour limit restored for PlusTue, 25 Aug 2026 12:00:00 GMT5-hour limit returned for Plus across Codex and ChatGPT Work; Pro $100/$200 kept without 5-hour limit 'for the upcoming months'. Announced by Codex lead Thibault Sottiaux on X; OpenAI's pricing page now states 'Pro plans currently have no five-hour limit' and publishes Plus 5h estimates. Source: https://learn.chatgpt.com/docs/pricing (checked 2026-10-19)https://planlimits.app/changelog/#2026-07-12-openai-codexplanlimits-2026-07-12-openai-codex-Codex 5-hour window temporarily suspendeSun, 12 Jul 2026 12:00:00 GMTOpenAI temporarily removed the 5-hour usage limit for Plus, Business and Pro, leaving weekly limits. OpenAI Support confirmed on the official forum it was temporary, as part of an incident response. Source: https://community.openai.com/t/why-the-5-hour-reset-missing/1386707 (checked 2026-10-19)