Posts for simonwillison.net on Sep 2026

29 links

← Today

29 A quote from John Gruber

28 A quote from Muse AI Agent

27 2026 in LLMs (so far)

26 A quote from @therealcornpop

25 OpenAI DevDay 2026 live blog

24 Release: llm-anthropic 0.29

23 Tool: Shadow roots, explained with live examples

22 Comment: We just shipped support for the ugliest part of HTTP: Vary

21 Claude Sonnet 5.5

20 Release: datasette 1.0a41

19 A quote from @joedaroo

18 Release: llm 0.36

17 Comment: S3 Is the Future, S3 Is the Past

16 SF October 14th: A Birds of a Feather Session on Agentic Engineering

15 Jev introduces a new shape of LLM—System One, aka Decision Models

14 Release: datasette-auth-github 1.0

13 Release: commit-rewriter 0.2

12 Release: llm-keys-ui 0.1

11 Tool: Bluesky reply bot checker

10 Release: llm-typesafe 0.1a0

9 Note on 24th September 2026

8 Release: datasette-explain 0.2.2

7 Tool: Kākāpō Party

6 Tool: Gemini 3.8 TTS Playground

5 Cloudflare Python Workers are now generally available

4 A quote from voxium

3 Comment: MCP was always a bad idea?

2 Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war

1 Codex bundles LibreOffice