Anthropic has formally announced Claude Sonnet 4.5, a new AI model specifically made for coding. Anthropic didn’t mince any words during its announcement, calling Claude Sonnet 4.5 the “best coding model in the world.” Starting today, it’ll be powering Claude Code, a popular choice for vibe coders and professionals alike.

The new model is a step up from the old models and seems to be able to do quite a lot. Per Anthropic co-founder and CEO Scott Wu, the new model features “the biggest jump we’ve seen since the release of Claude Sonnet 3.6” and can “run longer, handle harder tasks, and deliver production-ready code.”

Anthropic shows this through a variety of charts demonstrating how effective the model can be. For example, Claude Sonnet 4.5 has a lower instance of misaligned behav

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