ChatGPT Project Memory Explained: What Project-Only Memory Does and How to Change It

If you keep a ChatGPT project for something you would rather ChatGPT did not carry into every other conversation -- a health worry, a job hunt, a legal problem, a divorce -- the setting you wanted was until now locked at the moment you created it. In its ChatGPT release notes entry dated August 14, 2026, OpenAI says you can now "switch between default and project-only memory without starting a new project."

The sentence that decides whether this applies to you is in the same entry: "This update is available on all ChatGPT plans." Free included. It is one menu, three clicks, and no upgrade.

Key Takeaways

• You can now change an existing project's memory setting. OpenAI's wording is "For eligible unshared projects, switch between default and project-only memory without starting a new project."
• It is on every plan. OpenAI's August 14 release note says the update "is available on all ChatGPT plans." Its Projects help page used to back that with "available to all free and paid subscription types globally"; OpenAI deleted that sentence in late September 2026 and the page now reads "available to signed-in ChatGPT users, subject to plan availability and workspace settings."
• Project-only memory seals the project both ways. ChatGPT "won't reference memories or conversations from outside the project," and information from the project "is also kept out of memory used in chats outside the project."
• The path is: project, three-dot menu, Project settings, Memory. Then pick Default memory or Project-only memory.
• Shared projects cannot go back. Sharing sets a project to project-only memory automatically, and OpenAI says it "cannot be switched to default memory."
• ChatGPT Work does not work in a project-only project. OpenAI states that directly.
• Give it a few hours. OpenAI says "changes may take a few hours to take effect."
• One thing does get removed, and it is easy to miss. OpenAI: "When you switch a project to project-only memory, information from that project is removed from memory used outside the project." Your saved memories and the project's own chats and files stay; what the project had fed into memory elsewhere does not.

What Is Project Memory in ChatGPT?

A project in ChatGPT is a folder that holds related chats, files and instructions, and project memory is the rule for what ChatGPT is allowed to remember across them. OpenAI describes projects as "smart workspaces that keep everything related to a long-running effort in one place," and its Projects in ChatGPT help page says every project runs on one of two memory settings: default or project-only.

The difference is not how much ChatGPT remembers inside the project. Both settings let chats in a project draw on the other chats in that same project -- that is the point of a project. The difference is whether the wall around it is open or closed.

What Changed on August 14, 2026

The setting became changeable. Before this, you picked it once and lived with it. OpenAI's own Projects help page, in the version archived on July 20, 2026, put the old rule plainly: "Existing projects stay on default memory, while project-only memory can only be set when starting a new project."

That was a real annoyance rather than a technicality. If you started a project casually and it turned into something personal three weeks later, your only route to project-only memory was to build a second project and move everything across. The August 14 entry removes that: OpenAI now says you can switch "without starting a new project."

Two words in OpenAI's sentence are doing quiet work: "eligible unshared projects." OpenAI does not publish what makes a project ineligible, so if the option is missing from your Project settings, there is no published list to check it against.

How to Change a Project's Memory Setting

Four steps, quoted from OpenAI's own instructions in the August 14 entry:

1. Open the project.
2. Select the three-dot menu.
3. Choose Project settings.
4. Select Default memory or Project-only memory under Memory.

Then wait. OpenAI says "changes may take a few hours to take effect," which is the part most people will misread as the setting not working. If the project still seems to know your name and your job ten minutes later, that is the documented behaviour, not a bug.

One prerequisite is easy to trip over. OpenAI's Projects help page lists the account settings project memory depends on: on every subscription except Enterprise, you need both Reference saved memories and Reference chat history switched on in your personal settings. On Enterprise you need Reference saved memories in personal settings and Memory enabled in the workspace.

Default Memory vs Project-Only Memory

Here is what each setting actually permits, using OpenAI's own descriptions.

The row people miss is the fourth one. Project-only memory is not just a blindfold pointing inwards; it is also a seal pointing outwards. What you tell a project-only project does not leak into the memory ChatGPT uses when you are chatting about something else. That is the reason to bother with it.

Note that this describes personal and Plus, Pro, Go and Business accounts. OpenAI documents Enterprise and Edu separately, and on those, chats inside a project stay contained within the project even on default memory.

Which Plans Get It?

All of them, which is unusual enough to state plainly.

OpenAI wrote one sentence covering every plan here, rather than the plan-by-plan list it usually publishes. That sentence is in the release note, and it is the one this table rests on -- not the Projects help page, which OpenAI reworded in late September 2026 to the vaguer "subject to plan availability and workspace settings." Compare that with the interactive quizzes item in the very same August 14 entry, which is limited to consumer and Edu plans on web and mobile. For project memory OpenAI names no platform limit at all.

What plan does change is how big a project can get. OpenAI's help page sets file limits per project: 5 files on Free, 25 on Go and Plus, and 40 on Edu, Pro, Business and Enterprise.

The Three Limits Worth Knowing

Shared projects are one-way. OpenAI says a project's memory "is set automatically to project-only" the moment you share it, and it "cannot be reverted to default memory." Even removing every collaborator afterwards does not unlock it. If you want a project you can hand to someone later and still keep on default memory, that is not possible -- sharing is the trigger.

ChatGPT Work is unavailable in a project-only project. OpenAI states it outright: "ChatGPT Work is not available in projects using project-only memory." If you rely on the Work toggle for a piece of ongoing work, the privacy wall and the work tooling are a choice between two things, not a combination.

Project instructions still override your global ones. This is not new, but it surprises people who have just discovered Project settings. OpenAI's help page notes that project instructions "only apply inside the respective project and will override your global custom instructions."

Should You Turn On Project-Only Memory?

Turn it on if the subject is one you would not want surfacing elsewhere. Medical questions, money trouble, a job application you have not told anyone about, anything involving another person by name. This is the clearest use of the feature and it costs nothing on any plan.

Turn it on if a project keeps getting contaminated. If you have a project for a novel and ChatGPT keeps dragging in your day job because it remembers it, project-only memory is the fix. The quality reason is as good as the privacy one.

Leave it on default if you want ChatGPT to know you. A project about your training plan is better when it already knows your age, your injury and that half-marathon you mentioned in March. Sealing it off throws that away, and you will spend the first few messages re-typing it.

Leave it on default if you need ChatGPT Work in that project. OpenAI has made those mutually exclusive.

Do not treat it as a general delete button, but know that it does remove one thing. OpenAI: "When you switch a project to project-only memory, information from that project is removed from memory used outside the project." Your saved memories are untouched, so if your goal is to remove something ChatGPT has stored about you, this is still the wrong control -- manage saved memories in your account settings instead.

For the wider picture of what ChatGPT retains and what you can switch off, our explainer on Computer History for the ChatGPT Mac app covers the other recent memory control, and our best free AI chatbot in 2026 rundown compares how the main assistants handle this.

The bottom line: ChatGPT projects always had two memory modes, and the useful one used to be locked in at creation. Now you can flip an existing project either way from Project settings, on every plan including free. Use project-only memory for anything personal, expect it to take a few hours, know that flipping it removes that project's contribution to memory used elsewhere, and remember that sharing a project makes the choice for you permanently.

Sources: OpenAI's ChatGPT release notes -- the entry dated August 14, 2026 ("ChatGPT app experience updates") for the change itself, the four-step path, the all-plans availability, the few-hours delay, the shared-project rule and the ChatGPT Work exclusion. OpenAI's Projects in ChatGPT help page, re-read October 2, 2026 in its newest archived copy (captured September 21, 2026), for what each memory setting references, the required account settings, the per-plan file limits, the project-instructions override, and the removal rule. The previous restriction that project-only memory "can only be set when starting a new project" was quoted from the July 20, 2026 copy and is no longer on the page, which is the expected result of the August 14 change. The per-plan file limits re-verified unchanged: 5 on Free, 25 on Go and Plus, 40 on Pro, Business, Enterprise and Edu. OpenAI still does not publish what makes a project "eligible" for the switch, and there is still no dedicated help-centre article for this change linked from the changelog.

Corrections and Updates

October 2, 2026: this page quoted a sentence OpenAI has deleted, and the replacement is weaker. The page said OpenAI's Projects help page "says projects are available to all free and paid subscription types globally." That sentence was live through the September 11, 2026 capture and is gone from the newest one, captured September 21, 2026, which instead reads: "Projects and project sharing are available to signed-in ChatGPT users, subject to plan availability and workspace settings." The every-plan claim itself stands, because it rests on the August 14 release note, which still says verbatim "This update is available on all ChatGPT plans" -- but it now rests on one surface rather than two, and this page says so.

October 2, 2026: this page said project-only memory deletes nothing, and it does remove one thing. The page said "Nothing is deleted" and "it changes what ChatGPT is allowed to look at, not what it stores." OpenAI's Projects help page added this sentence between the July 20 and September 11, 2026 captures: "When you switch a project to project-only memory, information from that project is removed from memory used outside the project. The project's chats and files remain in the project and can continue to provide context there." Your saved memories are still untouched; what the project had contributed to memory elsewhere is not.