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Otto365 AI Brief #044

OpenAI: buying Pierre's tools to check the code AI agents write

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Published 5 Nov 2026, 17:30 UK
By the Otto365 AI Brief. The script was drafted with AI assistance, and every claim was checked against the sources below by our automated checks. Published on 5 Nov 2026 under the standing approval of Peter Ferguson, Editor.
Announced 4 Nov 2026
Voiced by AI

What happened

OpenAI's latest deal is about checking the code that AI agents write. OpenAI announced it will acquire Pierre, a developer tools company, on the 4th of November 2026. Pierre makes the file browser and change viewer inside the Codex app.1

Three things to know

Trees and Diffs First, Trees lets you browse a project's files, Diffs shows what changed, and its Edit mode fixes a line where you spot it. If you have reviewed a change in the Codex app, you have already used both.1
Two more Pierre tools Second, Highlights is a syntax highlighter that updates as a developer types or an agent streams code. Code Storage is a service that lets apps store code and track its history using Git.1
After the deal closes Third, Pierre's open-source projects stay open-source, and Code Storage customers can keep using it after closing while OpenAI works to bring its features into Codex. The deal needs regulatory approvals, and the companies stay separate until closing.1

Why it matters to you

Otto365's take (opinion)

So, my take. As coding agents write more code, the slow part becomes reviewing what changed. If a UK small business pays for software or builds tools with AI, someone has to check each change.1

Do this week

Try this: before approving code work, ask to see what changed.

Sources

OpenAI: OpenAI to acquire Pierre Computer Company, Inc. (opens in a new tab) Primary source, accessed 5 Nov 2026

The quotes we checked (16)

November 4, 2026 Company OpenAI to acquire Pierre Computer Company
OpenAI · source 1
Today we're announcing that OpenAI will acquire Pierre Computer Company
OpenAI · source 1
and a family of standout open-source developer tools
OpenAI · source 1
If you’ve browsed files or reviewed a change in the Codex app, you’ve already used Pierre’s Trees and Diffs libraries.
OpenAI · source 1
build on the Git workflows that developers already rely on and adapt them to how teams work with coding agents.
OpenAI · source 1
Trees lets developers quickly navigate a project’s files, and Diffs makes it easy to see what changed.
OpenAI · source 1
Diffs’ Edit mode lets a reviewer fix a line of code right where they spot the problem.
OpenAI · source 1
Pierre recently released Highlights, an extremely fast syntax highlighter that updates as a developer types or an agent streams code.
OpenAI · source 1
designed the API for Code Storage, a service that lets apps store code and track its history using Git.
OpenAI · source 1
Pierre’s open-source projects will remain open-source, and we’ll continue to contribute to them.
OpenAI · source 1
Customers can continue using Code Storage after the acquisition closes while we work to bring its features and functionality into Codex.
OpenAI · source 1
The closing of the acquisition is subject to customary closing conditions, including receipt of regulatory approvals.
OpenAI · source 1
Until closing, OpenAI and Pierre will remain separate and independent companies.
OpenAI · source 1
We’ve long appreciated the care Pierre brings to another part of working with Git: how developers review code.
OpenAI · source 1
Expanding Codex’s tools for building, understanding, and reviewing code.
OpenAI · source 1
how the systems around Git need to evolve as more of that work happens in parallel.
OpenAI · source 1

Full transcript

Sam: Otto! OpenAI to acquire Pierre!

Play from 0:02 Otto365: I know. OpenAI announced it will acquire Pierre, a developer tools company, on the 4th of November. Sam: What does Pierre actually make? Otto365: The file browser and change viewer inside the Codex app. It is about checking the code that AI agents write.

Play from 0:17 Sam: So how does that work? Otto365: Trees lets you browse a project's files. Diffs shows what changed. Sam: And if I spot a mistake? Otto365: Diffs has an Edit mode. It fixes a line right where you spot it.

Play from 0:29 Sam: What else is in the box? Otto365: Highlights, a syntax highlighter that updates as a developer types or an agent streams code. Otto365: And Code Storage, a service that lets apps store code and track its history using Git.

Play from 0:42 Sam: Do current customers lose anything? Otto365: OpenAI says Code Storage customers can keep using it after closing. Pierre's open-source projects stay open-source. Otto365: Its features are coming into Codex. The deal still needs regulatory approvals.

Play from 0:57 Sam: Brilliant! AI writes my code and I never look at it again! Otto365: As coding agents write more code, the slow part becomes reviewing what changed. My take: someone has to check each change. Sam: And someone is me.

Play from 1:11 Otto365: Lucky you're picky. Try this: before approving code work, ask to see what changed.

Otto365: I'm Otto365.

Follow the Brief.

On screen

Play from 0:00: Otto365 AI Brief #044, OpenAI, 4 Nov 2026; AI agents write code. Who reviews the changes?; Coding agent; Writes code; See what changed; You review
Play from 0:02: OpenAI to acquire Pierre; Announced 4 Nov 2026; Pierre's developer tools; Trees: browse files; Diffs: see what changed; Highlights: syntax; Code Storage: Git history; Source: OpenAI, 4 Nov 2026
Play from 0:17: Trees and Diffs; Browse the files; See what changed; Fix the line; Reviewed; Diffs: Edit mode; Spot the problem; Fix the line in place; Change reviewed
Play from 0:29: Two more Pierre tools; Developer types; Agent streams code; Highlights updates; Your app; Code Storage; Git history
Play from 0:42: After the deal closes; Stays: Open-source stays, Code Storage runs; Pending: Approvals needed, Still separate; Code Storage keeps running; Work to bring it into Codex; Needs regulatory approvals
Play from 0:57: Check every change; Coding agents: Write more code, Work in parallel; The slow part: Reviewing changes, Who checks it?; AI builds it; See what changed; Accept or fix it
Play from 1:11: Ask to see what changed; Voiced by AI. Fact-checked against its sources. Apps 365 sells AI and Microsoft 365 services. Not endorsed by companies named.

Voiced by AI. Fact-checked against its sources. Apps 365 sells AI and Microsoft 365 services. Not endorsed by companies named. Report an error.

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