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Claude Sonnet 4.5 from Anthropic is now the default model for Augment Code. We’re rolling it out to all customers over the next 24 hours, where it will be available alongside Sonnet 4 (for a limited time) and GPT-5 in the model picker.

Our early take on Sonnet 4.5 as compared to Sonnet 4? ✅ 34% fewer tool calls on average ✅ ~26% faster overall task completion time The result: the same accuracy, delivered with more speed and flow.