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Artificial Ignorance

Charlie Guo
Hundreds of paid subscribers

At the intersection of engineering and intelligence. Essays, analysis, tactics, news, and more.

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Substack
PricingFreemiumPublishesTwice weekly
Issues300Founded3 years agoLast Issue2 months ago
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Latest Issues

The Bots Are Reading Along

It’s been a little while! At the beginning of the month I got pretty sick, though admittedly it was nice to take my first publishing break in 3 years. But don’t worry: I’ve got more stuff in the works, including a Codex Basics livestream th...

2 months ago
25
6

BYOB: Build Your Own Benchmark

What do vending machines, corporate whistleblowers, and the board game Diplomacy have in common?

They’re all AI benchmarks.

Vending-Bench drops an AI agent into a simulated vending machine business and asks it to manage inventory, negotia...

3 months ago
23
6

The Emerging "Harness Engineering" Playbook

Earlier this month, Greg Brockman published a thread about how OpenAI is retooling its engineering teams to make them more effective with agents. The initiative was kicked off because of how much things have changed internally:

Some grea...

3 months ago
85
13

GPT-5.3-Codex and Claude Opus 4.6: More System Card Shenanigans

I’ve been trying to get this post out for nearly a week now, but I’ve been pretty busy with work! Thanks for bearing with me.


Last Wednesday, OpenAI and Anthropic both dropped new frontier models: GPT-5.3-Codex and Claude Opus 4.6....

4 months ago
33
5

The Codex App Has Upended My Daily Workflow

Disclaimer: Regular readers will know that I currently work at OpenAI. And while that certainly introduces some bias, the views presented here are entirely my own, without input from the company.

I’m unlikely to post about every new relea...

4 months ago
29
7

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  • Charlie Guo

    Writing at the intersection of software engineering and AI. Developer Experience Engineer at OpenAI. All opinions are my own.

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