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Simon Willison's Weblog
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Latest posts
Last updated about 5 hours ago
Anthropic: A postmortem of three recent issues
about 5 hours ago
Anthropic: A postmortem of three recent issues Anthropic had a very bad...
ICPC medals for OpenAI and Gemini
about 6 hours ago
In July it was the International Math Olympiad (OpenAI, Gemini), today it's...
Announcing the 2025 PSF Board Election Results!
1 day ago
Announcing the 2025 PSF Board Election Results I'm happy to share that...
Quoting Poul-Henning Kamp
2 days ago
I thought I had an verbal agreement with them, that “Varnish Cache”...
GPT‑5-Codex and upgrades to Codex
2 days ago
GPT‑5-Codex and upgrades to Codex OpenAI half-released a new model today: GPT‑5-Codex...
Models can prompt now
3 days ago
Here's an interesting example of models incrementally improving over time: I am...
gpt-5 and gpt-5-mini rate limit updates
5 days ago
gpt-5 and gpt-5-mini rate limit updates OpenAI have increased the rate limits...
London Transport Museum Depot Open Days
6 days ago
London Transport Museum Depot Open Days I just found out about this...
Comparing the memory implementations of Claude and ChatGPT
6 days ago
Claude Memory: A Different Philosophy Shlok Khemani has been doing excellent work...
Qwen3-Next-80B-A3B: 🐧🦩 Who needs legs?!
6 days ago
Qwen3-Next-80B-A3B Qwen announced two new models via their Twitter account (nothing on...
Defeating Nondeterminism in LLM Inference
7 days ago
Defeating Nondeterminism in LLM Inference A very common question I see about...