Simon Willison

@simonw

Creator @datasetteproj, co-creator Django. PSF board. Hangs out with @natbat. He/Him. Mastodon: fedi.simonwillison.net/@simon Bsky: simonwillison.net

San Francisco, CA

simonwillison.net

Joined November 2006

5,671 Following

229.7K Followers

Replies Reposts Media

Simon Willison
@simonw
12h
Just published this post about how we’re going to need default hard budget caps on pretty much everything
simonwillison.net
We’re going to need default hard budget caps on pretty much everything
Here’s a product feature which the world is going to need a whole lot more of over the coming months and years: default hard budget caps. I’m talking about the …
133
Simon Willison
@simonw
14h
Now that we've had a few days with it, how are people differentiating between Dot and regular ChatGPT? I'm having trouble deciding when I should prompt Dot vs using ChatGPT - my Dot seems to afford a single conversation, but I like controlling my context across multiple threads
132
Simon Willison
@simonw
Sep 29
I'm at OpenAI's DevDay event in San Francisco today - as I have for the past three DevDay events, I'm running a live blog where I'll be posting updates during the keynote, which starts in five minutes
simonwillison.net
OpenAI DevDay 2026 live blog
I’m at OpenAI DevDay today, in Fort Mason, San Francisco. Same as last year I’ll be live blogging the keynote and some other notes during the day. OpenAI gave me …
85
Simon Willison
@simonw
Sep 28
The most important thing about Sonnet 5.5 is that it's now the model that powers the free tier on claude.ai - so all of this stuff can be done by free users ChatGPT's free tier is still GPT-5.6 Luna, which is a lot less capable
Claude
@claudeai
Sep 28
A thread of early experiments with Claude Sonnet 5.5. A fall foliage simulator by @_re_pete, made with Sonnet 5 vs Sonnet 5.5.
00:00
187
Simon Willison
@simonw
Sep 28
I've published detailed notes and an annotated transcript to accompany the video of the keynote I gave at @WeAreDevs World Congress North America in San Jose on Friday - here's my rundown of everything that's happened with LLMs and agents in 2026 so far
simonwillison.net
2026 in LLMs (so far)
On Friday I gave the closing keynote at the WeAreDevelopers World Congress North America in San Jose. I tied together the key trends from the past year into a chronological …
63