Sonnet 5.5 becomes the free-tier model on claude.ai
Original titleThe most important thing about Sonnet 5.5 is that it's now the model that powers the free tier on https://claude.ai - so all of this stuf...
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Simon Willison says Claude Sonnet 5.5 now powers the free tier on claude.ai, so free users can run the kinds of experiments he describes. He contrasts this with ChatGPT's free tier, which he says still runs the less capable GPT-5.6 Luna.
Source: Simon Willison · x.com