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Memory, AI, and what changes in Cobrain.

Articles on how ChatGPT, Claude and coding agents remember, and how to give them a memory that stays yours. Further down, what is new in the product.

16 September 2026 · 5 min

ChatGPT memory full or not working: what to do, and how to make it remember

How ChatGPT's memory works in 2026, why it fills up or stops saving, how to fix it, and when a memory outside ChatGPT is the better answer.

Read16 September 2026 · 5 min

Claude memory: how it works across chats, and how to give Claude a memory that lasts

What Claude remembers on its own, how projects, chat search and Claude Code's memory fit together, and how to give Claude persistent memory you control.

Read16 September 2026 · 5 min

CLAUDE.md vs AGENTS.md: what goes in each, and what belongs in neither

Which file Claude Code and Codex actually read, how to keep one set of instructions for both, what to put in them, and where project knowledge should live instead.

Read

What's new

Your AI finds things better, and says when they are from

  • Every search result carries the note's date: the one in the frontmatter or in the file name, otherwise the day it was written. Moving a note does not change it.
  • When the words you search for are not all in the same note, the search widens and puts those results under a «maybe» line, apart from the certain ones.
  • A client's picture arrives even on big branches, with the most recent notes and the rules in full, and the list of what was left out puts the folders with news first.
  • A new page explains in five steps, without jargon, what happens when you ask your AI «when did we decide this?».

The new site, and all its pages

  • The home page tells the product's story with a brain of particles that scatters as you scroll, becomes a note and reconnects. On a phone it runs as smoothly as on a computer.
  • The pages about shared memory, the guides for connecting Claude, ChatGPT, Claude Code, Codex and Antigravity, pricing, what's new, privacy and terms.
  • The public documentation of the seventeen tools your AI uses in the brain.

The log becomes cards

  • Recent, favourites and shared all show the same row: title, branch, who wrote and when.
  • Every note says which branch it is in, including when it comes from a shared brain.

Connections is a guide, not a list

  • A step-by-step guide with screenshots for every program: Claude in four steps, ChatGPT in eight, plus Claude Code, Codex and Antigravity.
  • The page that authorises an AI states plainly what it will be able to read and write.

Dark theme, and emails on Cobrain's letterhead

  • The dashboard has a light/dark switch of its own, not just the system one.
  • The sign-in and sharing emails look like the product, in light and in dark.
  • The lists stay readable when narrow: the columns hold their place and wrap whole.

Two addresses: the site and the product

  • The public site lives at cobrain.space, the product at app.cobrain.space. The connector address for the AIs does not change.
  • Search says which brain each result is in, and the AIs pick the right brain by themselves.
  • Open a link without being signed in and you land on it after signing in, losing nothing on the way.

Units: clients, projects, whatever you follow

  • A folder with an index card becomes a unit: a client, a project, a student. Your AI opens it with a single command and receives the rules first, then the card, then the notes.
  • New tools for the AIs: start_session, list_units, create_unit and the guided brainstorm start_project.
  • You can share a folder even when it exists only because there are notes inside it.

The dashboard, rebuilt

  • The brain rail on the left, the working panel on the right, the log, ⌘K search, and the Recent, Favourites and All sections.
  • On the phone: a menu within thumb reach, actions that no longer overflow, and the brain switcher as a sheet from the bottom.
  • Sign-in rebuilt: a single page, with the stack and three promises.

The AIs get it wrong less, and you can see what they do

  • An AI adding a line can no longer wipe out the rest of the note by mistake: it is told to use append instead.
  • Search is five times faster.
  • Every AI call leaves a trace: tool, outcome, duration.

Cobrain launches

  • Notes in Markdown, in folders. Block editor and source. Sign-in with a link by email.
  • The AIs connect over MCP with an authorisation you can revoke whenever you want. Thirteen tools to read, search and write.
  • Sharing a branch, read or write, with an email notice. Version history for every note.
  • Import of an Obsidian vault.