Given the recent burst of activity around enterprise pricing and contracts, I think April 2026 was the month when both OpenAI and Anthropic found product-market fit https://simonwillison.net/2026/May/27/product-market-fit/
Who's Who of AI
Simon Willison
Open source developer building tools to help journalists, archivists, librarians and others analyze, explore and publish their data. https://datasette.io […]
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What they're sharing
I think Anthropic and OpenAI have found product-market fit simonwillison.net
Initial impressions of Claude Fable 5 simonwillison.net
Notes on Pope Leo XIV’s encyclical on AI simonwillison.net
Fable's judgement simonwillison.net
Uber Caps Usage of AI Tools Like Claude Code to Manage Costs simonwillison.net
Gemini 3.5 Flash: more expensive, but Google plan to use it for everything simonwillison.net
What's new in Claude Sonnet 5 simonwillison.net
Running Python code in a sandbox with MicroPython and WASM simonwillison.net
Publishing WASM wheels to PyPI for use with Pyodide simonwillison.net
Claude Opus 4.8: “a modest but tangible improvement” simonwillison.net
Have your agent record video demos of its work with shot-scraper video simonwillison.net
Datasette Apps: Host custom HTML applications inside Datasette simonwillison.net
Articles & links
Wrote up my initial impressions of Claude Fable 5 - it has a big model smell: slow, expensive and capable of crunching through pretty much everything I threw at it https://simonwillison.net/2026/Jun/9/claude-fable-5/
When I woke up this morning I didn't think I'd be spending a bunch of time today getting familiar with Catholic theology, but here we are. Notes on Pope Leo XIV's encyclical on AI. https://simonwillison.net/2026/May/25/encyclical-on-ai/
More notes on my blog: https://t.co/R2tCp4ThFH
Uber reportedly now caps coding agents at $1,500/month per employee per tool - seems sensible to me, but it's also an interesting hint at the value Uber thinks these tools are providing https://simonwillison.net/2026/Jun/3/uber-caps-usage/
My notes on Gemini 3.5 Flash - 3x the price of Gemini 3 Flash but Google are planning to use it for many of their own products https://simonwillison.net/2026/May/19/gemini-35-flash/
Notes (and a Pelican) on Claude Sonnet 5 - the new tokenizer makes it ~1.4x more expensive for English, ~1.33x more expensive for Spanish but roughly the same price for Simplified Mandarin https://t.co/UUnmjtPaSi
I may have finally found the Python-in-a-sandbox solution I've been looking for... here's my latest experiment, this time running MicroPython in WebAssembly inside my Python applications https://simonwillison.net/2026/Jun/6/micropython-in-a-sandbox/
It's now possible to compile Python extensions (C, C++, Rust etc) to WebAssembly and distribute them through PyPI such that Pyodide can install them directly https://simonwillison.net/2026/Jun/13/publishing-wasm-wheels/
Notes on Claude Opus 4.8, which Anthropic call "a modest but tangible improvement" - plus pelicans riding bicycles for each of the five different thinking efforts https://simonwillison.net/2026/May/28/claude-opus-4-8/
I've added video support to my "shot-scraper" browser automation tool - you (or your coding agent) can now create a storyboard YAML file and use that to record a video demo of new web application features https://t.co/NfRtrvplBf
Just launched Datasette Apps - a plugin for Datasette that lets you host full HTML+JS apps in an iframe sandbox that can query your database and do interesting things with your data https://simonwillison.net/2026/Jun/18/datasette-apps/
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In Simon Willison's orbit
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