Notes on "Mitchell Hashimoto"

Individuals I’m following, who actively write and contribute in the AI field:

• Simon Willison. A must-read in this field now. He’s been topping Hacker News in 2023–2025¹. I can’t believe how he manages to cover nearly every aspect of the frontier. If you could only follow one source, make it him. He’s also the co-creator of the famous Django web framework.
• Armin Ronacher. He’s the creator of a lot of Python libraries, like Flask and Click. Now he’s writing a lot about LLMs.
• Mario Zechner. I discovered him through his tiny but curated coding agent Pi, which has been turning heads recently². I haven’t taken a look yet, but will do.
• Mitchell Hashimoto. Ghostty’s creator. He’s writing a lot about his AI adoption in real development.

Here’s what I missed in the AI field this week — I was on holiday in Tokyo.

Two new models dropped within about 15 minutes of each other: Claude Opus 4.6 and GPT-5.3-Codex. Amp immediately adopted Opus 4.6 for its smart mode, but GPT-5.3-Codex is only available in their Codex app, not yet via the API. I believe Amp will adopt it for its deep mode once it’s generally available.

Amp is sunsetting the editor extension next month. It hasn’t been officially announced yet, but the team mentioned it in their latest Raising An Agent podcast episode. I use Amp exclusively through the editor extension, so unfortunately I’ll have to switch to the TUI version and get used to it.

Ghostty’s author Mitchell Hashimoto has been busy lately:

• Ghostty’s updated AI usage policy for contributions. More and more open source projects are drowning in AI-generated issues and PRs submitted without human review — the slop. He proposed a new policy for dealing with this trend. It’s not against AI, but makes every AI-generated contribution accountable to a human.
• Vouch, a community trust management system. A tool that puts the policy above into practice. To mitigate the slop burden, open source projects should build a network to identify trustworthy contributors.
• My AI Adoption Journey. Mitchell’s reflections on his AI adoption journey. Most of it resonates with me — and probably with every thoughtful developer.