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I've published detailed notes and an annotated transcript to accompany the video of the keynote I gave at @wearedevelopers.bsky.social World Congress North America in San Jose on Friday - here's my rundown of everything that's happened with LLMs in 2026 so far simonwillison.net/2026/Sep/27/...

simonwillison.net2026 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 …

Simon Willison

@simonwillison.net

Here's how I define "Fable class models" - first Claude Fable 5, now Claude Opus 5.5 and GPT-Astra 6 and maybe GPT-5.6 Sol as well

28/9/26, 5:53 pm0 reposts4 likes

Detroit Diva

@thedetroitdiva.bsky.social

There's a legitimate question whether it's always possible to give unambiguous instruction in a human language. Fortran or C, yes. English or French, not so much

Simon Willison

@simonwillison.net

And my closing thought on how this stuff impacts our lives as software engineers, with a quote from cycling champion Greg LeMond

Simon Willison

@simonwillison.net

(The full talk also covers New Zealand’s Kākāpō parrot breeding season, probably the best news of 2026)

Simon Willison

@simonwillison.net

Here's the video version on YouTube www.youtube.com/watch?v=GAkI...

youtube.comWWC26-NA - 2026 in LLMs (so far)YouTube video by WeAreDevelopers