The name is the button.

An agent writes the code now, and a human thumb hovers over Accept all a hundred times a day. The honest question of this decade is what, exactly, you just accepted. So I read the diff.

Eight years as a backend engineer in Stockholm, back in Tokyo since 2023, and I still ship something small most nights, usually badly. My one rule: the only real review of a model is the thing you built with it. That is why there is no leaderboard on this site.

Around a hundred and forty sources come through — the labs' own posts, the papers, the tools, the runtimes and languages nobody is watching yet, the chip under the demo, and the newsletters people actually forward. What is moving gets counted so the week reads at a glance, and every few days I explain one mechanism in plain words.

A story here is a headline, a short excerpt, one image and the link to whoever wrote it. We never reproduce the post; the images belong to their authors. A post written in Japanese appears in Japanese, exactly as it was published, and the link goes to the original.

— Yuki Halvorsen, Tokyo

← Accept All Archive

One Useful ThingVoices

Sign of the future: GPT-5.5

04.23

I had early access to GPT-5.5 1 , and I think it is a big deal. It is a big deal because it indicates that we are not done with the rapid improvement in AI.

Models & releases Funding & deals

Read at One Useful Thing ↗

One letter a week, starting soon.

Latest

Sign of the future: GPT-5.5

Related

VoicesClaude Dispatch and the Power of Interfaces One Useful Thing

VoicesClaude Code and What Comes Next One Useful Thing

VoicesThree Years from GPT-3 to Gemini 3 One Useful Thing

Europe79 Billion Words a Year: What Enterprise Localization Actually Looks Like at Booking.com DeepL Blog

VoicesOpen-world evaluations for measuring frontier AI capabilities AI Snake Oil

ResearchEmotion Concepts and their Function in a Large Language Model Transformer Circuits