What happened
OpenAI published a Help Center article, Understanding ChatGPT and Codex usage limits, saying that starting in December the usage allowance on Plus, Pro and Business plans will be shared across ChatGPT and Codex. OpenAI links the change to bringing the agentic capabilities of ChatGPT Work into the main ChatGPT experience. The article does not give an exact date in December.
How the shared limit works
Usage in both products will be measured in tokens, the units of information a model reads and writes. How much of the allowance a request uses depends on the model and the task: OpenAI says more advanced models and complex tasks generally use more. Instant chat will not draw from the allowance at all.
You will see the combined remaining usage and the reset times in Settings, then Usage. When you reach the limit, OpenAI lists three options: wait for the reset, upgrade your plan or buy credits to keep using eligible features. OpenAI says it expects most users will not have to wait for a reset more often than they do now.
What it means for you
Heavy Codex sessions and long agent tasks in ChatGPT will now compete for the same budget. If you rely on both, check Settings, Usage after the switch for a week to see which work consumes most, and use Instant for quick questions since it does not count.
The article does not list allowance sizes per plan or credit prices, and it does not mention Enterprise or Edu plans. Our guide to ChatGPT Pro plans and limits covers the current tiers.
Go to the source
Sources & further reading
Based on the official documentation below. Features and access can change; check the provider before making a decision.
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