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fry69 @fry69.dev · 29/09/2026

Here is @simonwillison.net's Sonnet 5.5 review: - Sonnet 5.5 is much more capable than Sonnet 5, on par with Opus 5.5, following the tradition for Anthropic to declassify their own models - Claude's free tier is now driven by Sonnet 5.5 -> simonwillison.net/2026/Sep/28/...

simonwillison.net

Claude Sonnet 5.5

New Sonnet model from Anthropic today. They say it "runs 30%+ faster, and costs up to 30% less for most work" - it's priced the same as Sonnet 5 but …

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fry69 @fry69.dev · 29/09/2026

Don't miss Simon's experiment with asking Claude's new free tier to draw a WebGL version of "Pelican on a bike": -> static.simonwillison.net/static/2026/... "Solid effort" is an understatement IMHO, especially for "free" (this may eat a considerable amount of "free" 5h allowance).

The most interesting thing about Sonnet 5.5 is that it's now the model used for the free tier on claude.ai. OpenAI's ChatGPT free tier uses Luna 5.6, which means Anthropic currently have a much more capable free offering.

I ran this prompt against that free tier:

build me an HTML page that renders a three-dimensional pelican riding a bicycle using WebGL

And got back this page, which is a solid effort.

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