Simon Willison's Weblog: Entries simonwillison.net

OpenAI DevDay 2025 live blog

simonwillison.net·31w

Embracing the parallel coding agent lifestyle

simonwillison.net·31w·Hacker News, Hacker News, Hacker News

Designing agentic loops

simonwillison.net·32w·Lobsters, Hacker News

Claude Sonnet 4.5 is probably the "best coding model in the world" (at least for now)

simonwillison.net·32w·Hacker News

I think "agent" may finally have a widely enough agreed upon definition to be useful jargon now

simonwillison.net·33w·Hacker News

My review of Claude's new Code Interpreter, released under a very confusing name

simonwillison.net·35w·Hacker News, Hacker News

Recreating the Apollo AI adoption rate chart with GPT-5, Python and Pyodide

simonwillison.net·35w·Lobsters, Hacker News

GPT-5 Thinking in ChatGPT (aka Research Goblin) is shockingly good at search

simonwillison.net·35w·Hacker News, Hacker News

V&A East Storehouse and Operation Mincemeat in London

simonwillison.net·37w

The Summer of Johann: prompt injections as far as the eye can see

simonwillison.net·38w·Hacker News

Open weight LLMs exhibit inconsistent performance across providers

simonwillison.net·38w

LLM 0.27, the annotated release notes: GPT-5 and improved tool calling

simonwillison.net·39w·Hacker News

Qwen3-4B-Thinking: "This is art - pelicans don't ride bikes!"

simonwillison.net·39w·Hacker News

My Lethal Trifecta talk at the Bay Area AI Security Meetup

simonwillison.net·39w·Hacker News

The surprise deprecation of GPT-4o for ChatGPT consumers

simonwillison.net·39w·Hacker News

GPT-5: Key characteristics, pricing and model card

simonwillison.net·39w·Hacker News

OpenAI's new open weight (Apache 2) models are really good

simonwillison.net·40w·Hacker News

ChatGPT agent's user-agent

simonwillison.net·40w·Hacker News, Hacker News

ChatGPT agent triggers crawls from Bingbot and Yandex

simonwillison.net·40w·Hacker News

The ChatGPT sharing dialog demonstrates how difficult it is to design privacy preferences

simonwillison.net·40w·Hacker News

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