A dated record of every publicly-announced change to subscription quotas, rolling windows, and one-off resets for subscription-based code agents. Every entry links to the official record — vendor announcement, help-center article, changelog, or staff post.
Last logged event: Apr 28, 2026.
Calendar
Usage resets and rate-limit changes plotted by announcement date.
OpenAI's Tibo Sottiaux posted that Codex rate limits had been reset for all paid plans to "celebrate a good week" and let users build more with GPT-5.5. The actual reset turned out to be narrower than the wording — OpenAI Support later confirmed weekly Codex limits were not reset for all accounts.
ChatGPT PlusChatGPT ProBusinessEnterprise
·Announcement covered every paid ChatGPT/Codex tier in wording.
·Implementation only refreshed eligible quota intervals (often the 5-hour window); weekly limits were not universally reset.
·Codex Usage UI did not surface that a special reset had been applied.
Sam Altman announced that Codex had reached 4 million active users less than two weeks after the 3M milestone and that OpenAI would reset rate limits that day. This was the next milestone reset under the earlier pledge to reset limits at each additional million users up to 10M.
ChatGPT PlusChatGPT ProBusinessEnterprise
·Reset announced on April 21, 2026.
·Followed the April 7 3M weekly-user reset commitment.
·Public reporting quoted Altman's post: “Codex hit 4M active users… We will reset rate limits today!”
OpenAI announced a new $100/month Pro tier for Codex-heavy users, temporarily raising it to up to 10× Plus usage through May 31. OpenAI also extended the $200 Pro 2× Codex usage promo through May 31 and said it had reset Codex rate limits again for existing $200 Pro users.
ChatGPT Pro $100ChatGPT Pro $200
·Pro $100: standard 5× Plus usage, temporarily boosted to up to 10× Plus through May 31, 2026.
·Pro $200: remains highest-usage tier; 2× Codex promo extended through May 31, 2026.
·Announcement explicitly included another Codex rate-limit reset for existing $200 Pro users.
OpenAI announced Codex hit 3 million weekly users and reset usage limits to mark the milestone. Sam Altman said the reset would repeat at each additional million weekly users up to 10 million.
ChatGPT PlusChatGPT ProBusinessEnterprise
·Reset applied across paid Codex tiers as a one-time growth-milestone refresh.
·Future resets committed at 4M, 5M, …, 10M weekly users.
·Same day, the ChatGPT-sign-in Codex model lineup was trimmed (April 14 retirements).
OpenAI began moving Codex pricing from average per-message estimates to token-based credit rates, with usage computed against input, cached input, and output tokens. The Codex pricing page continues to describe 5-hour usage windows and notes that additional weekly limits may apply.
ChatGPT PlusChatGPT ProBusinessEnterprise
·As of April 2, Codex rate cards started moving to credits per million input, cached input, and output tokens.
·Plus: GPT-5.5 shows 15–80 local messages per 5-hour window.
·Pro $100: 5× Plus by default, with a temporary 10× promo through May 31, 2026.
·Pro $200: 20× Plus by default, with a temporary 25× 5-hour limit promo through May 31, 2026.
·Enterprise / Edu flexible-pricing usage scales with credits rather than fixed per-seat limits.