Codex Usage Limit: Real Cap or the 40,000-Account Bug?
Codex Usage Limit: Real Cap or the 40,000-Account Bug? Last updated: November 3, 2026 Short answer: On October 20, 2026, OpenAI publicly confirmed that a bug applied the wrong usage limits to approximately 40,000 Codex accounts. So a meter draining at a speed that makes no sense may not mean you hit a real cap at all, and this guide separates that confirmed bug from real usage limits, which have…
OpenAI confirmed on October 20, 2026 that a bug was causing 40,000 Codex accounts to incorrectly use up their usage limits. This bug has been fixed and OpenAI is adding credits to affected accounts. However, not all reports of Codex usage draining faster than expected are due to this bug. Codex does not have a fixed messages per day limit, but rather limits vary based on model, task complexity, context size, and whether the task runs locally or in the cloud.
Codex and ChatGPT usage share a common allowance pool, and heavy Work sessions can drain this pool quickly. There is a 5-hour rolling window for Plus and Standard Business plans, and a weekly limit for Pro plans. Speed modes (Fast and Ultrafast) use included usage at 2.5 and 8 times the standard rate respectively. To check real usage, visit the usage dashboard in ChatGPT settings or the usage and billing section.
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