On Oct 31, OpenAI's Help Center added a page titled "Understanding ChatGPT and Codex usage limits": starting in December, the usage allowance on Plus, Pro, and Business plans will be shared across ChatGPT and Codex as OpenAI brings the agentic capabilities of Work into the main ChatGPT experience. Usage will be measured in tokens, so stronger models and more complex tasks use more; Instant chat will not draw from the allowance. Users will see combined remaining usage and reset times in Settings > Usage, and can wait for a reset, upgrade, or buy credits when they run out. OpenAI says it expects most users will not need to wait for resets more often than they do now, but it has not given an exact start date or per-plan allowances. The news drew strong concern from Plus users on X.
Key Takeaways
- ✓Timing: takes effect in December, exact date not announced; covers Plus, Pro, and Business plans (OpenAI Help Center)
- ✓Metering: everything is measured in tokens and Instant chat is excluded; the Business pricing page now also notes that plan usage will have a shared limit across ChatGPT and Codex starting in December (Business pricing)
- ✓Today's baseline: only Work and Codex share an allowance now; Plus is estimated at 5-45 local messages per 5 hours on GPT-6 Astra, 15-160 on GPT-6.1 Sol, and 350-3,000 on GPT-6 Luna (official estimates, help article)
- ✓Pro 100/200/500 currently have no 5-hour limit in Work and Codex; per-plan allowances after the merge have not been published
- ✓OpenAI's position: most users should not wait for resets more often than today; when out, wait, upgrade, or buy credits
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Background and pain point
For the past year, ChatGPT chat and Codex coding ran on separate allowances: chat was limited by message counts, while Work and Codex shared one pool consumed by tasks. Heavy coders could burn through Codex without touching their everyday chat. OpenAI is now merging the two, saying it is bringing Work's agentic capabilities into the main ChatGPT experience, so one interface gets one allowance. Many Plus users on X worry that heavy Codex use will now eat into chat.
Architecture
The new rule is token metering plus a single allowance pool: usage is no longer counted per message but by the tokens the model processes and generates, so stronger models and complex tasks drain it faster. Instant chat is explicitly excluded. The new page does not say whether today's 5-hour and weekly windows stay. Combined remaining usage and reset times will appear in Settings > Usage.
Benchmarks
This is a billing change, so there are no benchmarks. The official reference numbers are today's Work and Codex estimates: Plus gets roughly 5-45 local messages per 5 hours on GPT-6 Astra and 15-160 on GPT-6.1 Sol, and Pro tiers currently have no 5-hour limit in Work and Codex. OpenAI has not published how many tokens each plan gets after the merge.
Getting started
Before December, note your current burn rate in Settings > Usage and with /status in Codex CLI. Use Instant for everyday questions to save the allowance for Codex and complex tasks, and move long agent runs to lighter models. If your automation runs on the API, it is billed separately at API rates and is not affected by this merge.
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