OpenAI Codex changelog

New ChatGPT Pro 500 plan at $500 a month

OpenAI announced a Pro 500 plan at $500 a month with its highest included usage and Ultrafast access in ChatGPT Work and Codex.

Who is affected:

Heavy Codex and ChatGPT Work users.

What to do:

Compare Pro 500 against Pro 200 plus credits.

Five-hour usage limit returns for Plus in Codex and ChatGPT Work

OpenAI said the five-hour usage limit returns for Plus subscribers in Codex and ChatGPT Work from August 25, after several weeks with only a weekly cap. Pro $100 and Pro $200 stay without the five-hour limit for now.

Who is affected:

ChatGPT Plus users who run Codex or Work.

Action needed:

Spread heavy Codex sessions across five-hour windows or buy credits.

Premium seats on ChatGPT Business with 5x usage and no five-hour limit

ChatGPT Business added premium seats with 5x more usage and no five-hour usage limit.

Who is affected:

ChatGPT Business workspaces.

What to do:

Admins: decide which members need premium seats.

OpenAI finds abuse systems wrongly rate-limited some Codex accounts

OpenAI's status page investigated reports of Codex usage limits depleting faster than expected from June 26 and said some were caused by its abuse and fraud prevention systems incorrectly rate limiting certain accounts. It was resolved June 29, 2026.

Codex adds banked rate-limit resets for Plus and Pro

Codex added rate-limit reset banking for Plus and Pro users, with one free reset at launch and more earned through referrals during a promotion.

Codex pricing moves to API token usage instead of per-message

OpenAI published a Codex rate card that ties Codex credit usage to API token usage rather than a per-message estimate. The Hacker News thread drew 211 points and 193 comments. The OpenAI help page blocks automated access, so details beyond the headline were not verified.

Who is affected:

ChatGPT plan users who buy Codex credits.

What to do:

Check the Codex rate card before buying credits.

Codex adds pay-as-you-go pricing for Business and Enterprise

OpenAI added pay-as-you-go Codex pricing for ChatGPT Business and Enterprise.