OpenAI will share the ChatGPT and Codex quota in December

The announcement also mentions credits to keep using eligible features when the included quota runs out. And there is an important difference: automatic credit top up, or auto top-up, does not increase the included allowance in the plan. It is an additional purchase that can be triggered automatically, if it is available and enabled on the account.

What changes to the ChatGPT and Codex quota

The OpenAI official page on usage limits states that, starting in December, Plus, Pro and Business will have a shared quota between ChatGPT and Codex. Consumption will be measured in tokens, not by a fixed number of messages: more advanced models and more complex tasks tend to use more of the allowance.

Instant mode will not consume this shared quota. This does not mean that all models, tools or ChatGPT features are unlimited, it only means that Instant is outside this specific limit.

OpenAI says it will be possible to check the combined balance and renewal times in Settings → Usage. If the quota runs out, the announced options are to wait for renewal, change plans or buy credits for eligible features.

The company says it expects most people will not need to wait for renewal more often than today. This is an OpenAI expectation, not a guarantee that each user will keep the same capacity: without the per plan limits and the complete usage rules, it is not yet possible to compare the experience of each account.

The notice also previews tasks inside ChatGPT

The email sent to subscribers also talks about bringing agent tasks inside ChatGPT, such as creating websites and presentations or taking actions on the web, without switching to the Work tab. According to the BleepingComputer report, which had access to the notice, the integrated experience will start as a test for a small group. Therefore, it is not correct to assume that this feature is already available to all accounts.

This interface change and the shared quota are related to the integration between Chat and Work, but they are different points: the first is about where tasks are started, the second is about how plan usage will be accounted for.

Auto top-up is not the same as shared quota

The OpenAI credits documentation explains that the included allowance is used first. After the limit is reached, credits can cover compatible features, depending on the plan and account availability. Credits are a paid add-on, not a permanent increase to the included allowance.

Auto top-up is a different mechanism, documented by OpenAI on the page for credits for flexible use and in the ChatGPT update notes. If the option is available for the account, the person sets a minimum balance and a target balance. When credits fall below the minimum, OpenAI automatically buys enough credits to reach the target, using the default payment method on file.

There is an important caveat: if the balance is already below the minimum when top-up is activated, a purchase may happen immediately. The function buys usage credits, it does not top up a dollar wallet nor replenish the included allowance in the plan. Availability and the features that accept credits vary by account, check the options shown in Settings → Usage before enabling.

In summary: the shared quota is the plan allowance that will be used by ChatGPT and Codex, credits are paid additional usage for compatible features, and auto top-up is an optional way to buy those credits automatically. Automatic recharge should not be interpreted as unlimited use nor as a guaranteed part of the new quota.

What OpenAI still needs to clarify

Public documentation confirms a December start, but it still does not provide the exact date, the quota values per plan, how current limits will be converted, or examples of consumption by model and task type. We should also not extrapolate the change to plans not mentioned in the announcement, the official page names Plus, Pro and Business.

API usage is a separate mode: OpenAI documentation distinguishes signing into Codex with a ChatGPT account from using your own key, which follows API billing. Check the official guidance on using Codex with the ChatGPT plan before comparing the two access methods.

How builders can prepare

1. Before the change, check Settings → Usage and note the balance and renewal times shown for your account.
2. Once the combined quota is active, track which models and tasks consume the most, documentation does not provide a fixed conversion from messages to tokens.
3. For long work, split the request into verifiable steps. Use the model and reasoning level appropriate to the task instead of assuming each interaction costs the same.
4. If you consider credits or auto top-up, check eligibility, covered features, minimum balance, target balance, payment method and any spending limit shown on your account. Remember that activation can trigger an immediate purchase if the balance is already below the minimum.
5. If you build prototypes with Sites, the Codex documentation states that creating or editing a Site counts as Codex usage. Also see our step by step guide to build an AI app using ChatGPT Sites and the guide on hardware prototyping with Codex.