Your AI Remembers the Matter You Walled Off
Same $25 a seat. Same privacy promise. One of them pools your chats the moment you share a project, and most firms never notice.
When Your AI Remembers: Claude Team vs ChatGPT Business for Confidential Client Work
TL;DR: Both Claude Team and ChatGPT Business keep your data out of model training by default, and both cost about $25 per seat per month. The real split is how each one handles projects and memory. Claude gives every project its own separate memory and keeps individual chats private even inside a shared project. ChatGPT’s shared projects are built to pool everyone’s chats for the team, and they lock memory down automatically the moment you share them. The gap sits somewhere you wouldn’t look: the matter you’re working alone.
You’ve probably already had the moment. You open a fresh chat, and the assistant already knows your writing style, the matter you’re on, the thing you mentioned Tuesday. Handy. Right up until you remember you’re a lawyer, and “it remembers everything” is not a feature you hand a client without thinking hard about it first.
Here’s what changed. Memory used to live inside a single conversation. Close the tab, and the context was gone. Now the big assistants carry context across conversations by default. Claude switched it on for team plans last September, then for everyone this past March. ChatGPT has its own version. Fine for a marketing team. A live problem for a firm that owes every client a duty of confidentiality and sometimes has to keep two of its own lawyers from seeing each other’s files.
So the question stopped being “which chat did I use.” It became “which matter is this, and where is it walled off.” And the answer, for both tools, runs through projects.
A project is just a container. Treat it like a matter.
Forget the product tours for a second. A project is a box. You put a matter in it, you tell the assistant how to behave, and from then on your chats happen inside the box instead of out in the open. Claude and ChatGPT both have them. They both call them projects. Fine.
The point, for us, is keeping matters apart. One matter, one project. Get that right and the case you’re mid-conversation on can’t leak into a memo for a different client an hour later. Both tools can do this. What they don’t agree on is what happens when nobody touches the settings. And at most firms, nobody touches the settings.
I was presenting to a large team in person last week when I saw the “oh sh*t” look land on someone’s face as they realized what had been happening in their chats.
The sharing default is where the two part company
People get this next part backwards, so let me be exact, because I’ve now spent real time sharing chats in both and they do not feel the same.
In ChatGPT, sharing a project means sharing the chats inside it. On purpose. The assistant reaches across the whole project, other people’s conversations included, and anyone you pull in through a workspace link starts with chat access until you say otherwise. That’s the selling point. Everyone lands in the same project and builds on each other’s threads without thinking about it. It behaves like one shared workspace, which is exactly what it’s meant to be.
Claude went the other way, and the mechanics tell the story. Share a project and you’ve handed over the files (the knowledge base), the instructions, the ability to open a chat. Not your chats. Those stay yours. When you do want a teammate to see one, you share that single conversation, and it lands for them in a separate tab called Activity, off to the side from the chats they started themselves. So inside a Claude project you’ve really got two piles: your own private chats, and whatever’s been shared into Activity. Nothing pools on its own. Even opening a project to the whole firm exposes the container, not the conversations.
And what lands over there isn’t live. It’s a snapshot, frozen at the moment you shared it. Everything you type afterward stays yours. Files you attached don’t travel with it either. For our purposes that’s a feature, not a limitation.
That gap isn’t only about privacy. It’s about friction. Sharing in Claude is deliberate and one conversation at a time, and the shared material sits apart in its own tab, so working together never quite clicks into a single space. ChatGPT clicks. Both are defensible, and I mean that. For a matter that has to stay behind a wall, Claude’s friction is the feature. For two lawyers building the same brief on a deadline, it’s a tax you’ll feel by Wednesday.
Before you write either one off. Outside a shared project, both keep your chats to yourself, and neither lets an admin wander through your private conversations on a whim. On a whim. A Claude Team owner can still pull an organization-wide data export, and your conversations are in it.
Memory containment: the trap isn’t where you’d look
Memory is the other place they split, and this one surprised me.
Claude handles it without being asked. Every project keeps its own memory, and the running memory Claude builds from your history skips whatever happened inside a project. Anthropic calls that boundary a safety guardrail, which is the right word for it. Two locks on the same matter, and you turned neither one.
ChatGPT locks the same door. Here’s the twist: the moment you share a project, it locks the door for you. Project-only memory switches on automatically, whatever that project’s setting was a second earlier, and you cannot switch it back.
So where’s the exposure? Not where you’re looking. It’s the solo project. The unshared one. The matter you’re handling alone at 9 p.m. Leave that on default memory and it can reach into your other conversations, and your other conversations can reach into it. You choose project-only when you create the project, or you don’t get it. No global setting to apply it everywhere. No fixing it later. That project you built in March can’t be converted. You’d have to make a new one.
Read that twice if you’re the person who sets these up. The shared matter takes care of itself. The one you’re carrying alone is the one that bleeds.
There’s an incognito mode on Claude for conversations you want kept out of memory and history entirely. Two catches. It doesn’t work inside a project, so don’t build your matter workflow around it. And on a Team plan those chats still sit on a server for at least thirty days and still turn up in an owner’s data export. Useful. Not a shredder.
Cost isn’t the tiebreaker. Quality might be.
Here’s the part that surprises people. On price, these two are basically the same. Claude Team’s standard seat runs $25 per seat per month, or $20 on annual billing. (There’s a premium seat at $125 for heavy users. Most lawyers won’t need it.) ChatGPT Business is the same $25 monthly, same $20 annual, after OpenAI knocked five dollars off both this past April.
The catch at your size isn’t the rate. It’s the floor. Claude bills a five-seat minimum, ChatGPT a two-seat minimum. So a three-lawyer shop pays Claude for five seats whether or not five people ever log in. On ChatGPT it pays for three. Under about five lawyers, that floor decides more than the price does.
Which frees you up to decide on the thing that actually varies: the output. My own view, and I’ll own it as a view, is that Claude is the better writer. It hands you cleaner, more finished prose, the kind you can put in front of a client with less editing. ChatGPT is the stronger reasoner and researcher. When I need something thought all the way through, or a pile of material pulled apart and pressure-tested, that’s where I reach.
Notice that’s a quality preference, and it has nothing to do with the confidentiality setup. Which is why plenty of firms run both, and why the smart move isn’t to crown a winner. It’s to standardize how you contain a matter, then use whichever tool does the job in front of you better.
The honest caveats
A few things I owe you straight.
The pooled-chat default in ChatGPT is a real advantage when you actually want it. Practice groups working a shared body of law, research teams, anything not behind a wall, all benefit from people seeing each other’s work. Claude’s private-by-default can feel like friction on exactly those jobs.
None of this replaces an actual ethical screen. Software defaults help, but a wall you enforce with people, access rules, and a written policy is the thing that holds up if someone asks. Don’t let a memory setting stand in for a real screen.
And settings move. What I’ve described is how these products behave in mid-2026. Vendors change defaults, rename features, and shift what sits in which tier. Before you rely on any single behavior for a sensitive matter, confirm it in the current documentation and in the terms you signed up under.
What to do Monday morning
Make “one matter, one project” a written rule before anyone pastes a privileged document into either tool. The rule is the cheap part. The habit is what protects you.
Set containment when you create the project, because on ChatGPT you can’t add it afterward. Choose project-only memory, and set sharing to invite-only rather than anyone-with-the-link. That link only reaches your own workspace, but in a small firm your workspace is the whole firm, which is the exact problem a wall exists to solve. On Claude the per-project memory is already on, so the only thing to remember is that incognito won’t help you inside a project.
Pick your default tool by how your firm actually works, then confirm nobody switched training on. Claude’s private-by-default is less to babysit when matters run one lawyer deep. Business earns its keep if you collaborate constantly and you’ll own the walls yourself. Either way, tell your people not to hit the thumbs-up button on a privileged chat. On Claude, rating a conversation hands it over.
Here’s the thing to hold onto: Which AI writes a better memo is a preference you can argue about all week. Whether a walled-off matter stays walled off is a duty you owe the client - and at most firms, that comes down to one default nobody thought to check.
Set that default on purpose. Write it into a rule. Confirm it against your obligations before the next privileged document goes in.
If you want a second set of eyes on how your firm contains matters across these tools, I’m at steve@intelligencebyintent.com. This is the kind of thing worth getting right before someone asks you to prove it.