Simon Willison's Weblog

How I think about Codex

How I think about Codex (https://www.linkedin.com/pulse/how-i-think-codex-gabriel-chua-ukhic) Gabriel Chua (Developer Experience Engineer for APAC at OpenAI) provides his take on the confusing

Quoting Thibault Sottiaux

We’ve made GPT-5.3-Codex-Spark about 30% faster. It is now serving at over 1200 tokens per second. — Thibault Sottiaux (https://twitter.com/thsottiaux/status/2024947946849186064), OpenAI

Quoting Thariq Shihipar

Long running agentic products like Claude Code are made feasible by prompt caching which allows us to reuse computation from previous roundtrips and significantly decrease latency and cost. [...] At

Gemini 3.1 Pro

Gemini 3.1 Pro (https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-1-pro/) The first in the Gemini 3.1 series, priced the same as Gemini 3 Pro ($2/million input,

Typing without having to type

25+ years into my career as a programmer I think I may finally be coming around to preferring type hints or even strong typing. I resisted those in the past because they slowed down the rate at which

Quoting Martin Fowler

LLMs are eating specialty skills. There will be less use of specialist front-end and back-end developers as the LLM-driving skills become more important than the details of platform usage. Will this

Rodney v0.4.0

Rodney v0.4.0 (https://github.com/simonw/rodney/releases/tag/v0.4.0) My Rodney (https://github.com/simonw/rodney) CLI tool for browser automation attracted quite the flurry of PRs since I announced

Quoting ROUGH DRAFT 8/2/66

This is the story of the United Space Ship Enterprise. Assigned a five year patrol of our galaxy, the giant starship visits Earth colonies, regulates commerce, and explores strange new worlds and

Quoting Dimitris Papailiopoulos

But the intellectually interesting part for me is something else. I now have something close to a magic box where I throw in a question and a first answer comes back basically for free, in terms of