One memory, every model
Living Brain is a memory layer that sits outside the AI model. What you save from one tool can be retrieved in another: ChatGPT, Claude, Cursor, Codex and agents a team builds itself.
It comes from ChatAndBuild, the Singapore company behind chatchat, AI agents you chat with that each carry a Living Brain. Its founder, Christel Buchanan, previously worked at X.
ChatAndBuild reports 92.2% judged accuracy on LoCoMo, a benchmark for memory over long conversations, against 72.3% for a full-context, model-only baseline. It also reports 464ms median retrieval and up to 22.6 times fewer tokens per question.
We decoupled memory from the model.
That line carries the launch. Anyone who has explained the same project twice to two AI tools knows the problem, and the post names the fix in six words.
What Doomers AI ran
Doomers AI ran the launch. The post went out from the founder’s own account, and the company account had about 3,500 followers, so the launch window had to bring the audience.
Creators, founders and engineers from the network, with audiences in AI and developer tools, quoted the post in the first hours with their own take on it. A memory that follows you across tools fits in one line, and each quote put it in front of people who switch between several AI tools every day.
The product, the benchmarks and the copy were Living Brain’s. The timing, the voices and the first hours were ours.
Investors came to them
In the days after the launch, at least four tier 1 venture firms reached out to ChatAndBuild. The post did the introductions: investors who had never heard of Living Brain saw it in their feed the same morning as everyone else.
Past Notion on the same day
At 19:14 UTC on the same day, five hours after Living Brain, Notion launched a shared brain for agents: ChatGPT, Claude and Notion’s own agents saving what they learn to one memory in Notion. It went out to 535,329 followers.
| Launch | Followers | Views | Likes |
|---|---|---|---|
| Living Brain | 41,163 | 4.7M | 6,730 |
| Notion shared agent brain | 535,329 | 1.4M | 5,965 |
A founder account thirteen times smaller drew more than three times the views on the same idea, on the same day.
#2 on Product Hunt the next day
On 5 November Living Brain launched on Product Hunt under ChatAndBuild and ranked #2 Product of the Day, in Productivity, Developer Tools and Artificial Intelligence. The X launch the day before had already put it in front of the people who vote there. Our Product Hunt launch strategy guide covers how the two fit together.
The launch by the numbers
| Measure | Value |
|---|---|
| Views | 4,709,145 |
| Bookmarks | 9,429 |
| Likes | 6,730 |
| Quote posts | 286 |
| Reach against its following at launch | 114 times |
| Against Notion’s launch the same day | More than three times the views, from a thirteenth of the following |
| Investor inbound | At least four tier 1 VCs reached out |
| Product Hunt | #2 Product of the Day, 5 November 2026 |
| Followers | About 41,000 at launch, 47,638 now |
The post
We decoupled memory from the model.
Living Brain is one persistent brain for ChatGPT, Claude, Cursor, Codex and your own agents. Write in one, retrieve in any.
92.2% on LoCoMo. 464ms median retrieval. Up to 22.6x fewer tokens per question.
LLMs have parameters. Living Brain has plasticity.
See the live numbers on the launch page →
How Doomers AI launches work
The creators in a Doomers AI launch are paid for their posts, and every compensated post carries X's paid partnership label. Our disclosure policy.
Questions we get asked
What is Living Brain?
Living Brain is a memory layer that sits outside the AI model. What you save from one tool can be retrieved in another: ChatGPT, Claude, Cursor, Codex and agents a team builds itself. ChatAndBuild reports 92.2% judged accuracy on the LoCoMo memory benchmark, 464ms median retrieval and up to 22.6 times fewer tokens per question.
Who makes Living Brain?
ChatAndBuild, a Singapore company that also makes chatchat, AI agents you chat with that each carry a Living Brain. Its founder is Christel Buchanan, who previously worked at X.
Who ran the launch?
Doomers AI. We ran the launch window around the founder's post: creators, founders and engineers from the network with audiences in AI and developer tools quoted it in the first hours with their own take.
How many views did the launch get?
The founder's post stands at 4.7M views from an account of about 41,000 followers when it went out, 114 times that following. It drew more bookmarks than likes, and the next day Living Brain ranked #2 Product of the Day on Product Hunt.
How did it compare with Notion's launch the same day?
Notion launched a shared brain for agents in Notion five hours later, from an account of about 535,000 followers. Living Brain's post drew more than three times the views from an account a thirteenth the size.