India, Sept. 30 -- Anthropic introduced Claude Sonnet 4.5 on 29 September 2025, positioning the new model as a significant step forward, particularly in coding, computer use, and complex agent building. The company concurrently announced a suite of product updates for its developer platform and consumer applications.

The new model shows significant gains in technical benchmarks. On the SWE-bench Verified evaluation, which tests real-world software coding skills, Claude Sonnet 4.5 achieves state-of-the-art results. The company notes observations of the model maintaining focus on demanding, multi-step tasks for over 30 hours.

In terms of utilising computers, Sonnet 4.5 represents a substantial jump. The model recorded a 61.4% score on the...