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Simon Willison
@simonwillison.net

Wrote up my initial impressions of the brand new Claude Sonnet 4.5 - I think it may live up to Anthropic's claims of being the "best coding model in the world", for the next few weeks at least! simonwillison.net/2025/Sep/29/...

simonwillison.netClaude Sonnet 4.5 is probably the “best coding model in the world” (at least for now)Anthropic released Claude Sonnet 4.5 today, with a very bold set of claims: Claude Sonnet 4.5 is the best coding model in the world. It’s the strongest model for building …

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