Anthropic has launched Claude Sonnet 4.5, its newest AI model, claiming significant advancements in autonomous work and coding.

The company said that the model was able to run autonomously for 30 hours, maintaining sustained focus with minimal oversight while building an entire software application. It’s a significant improvement over the company’s previous Opus 4 model, released four months ago, which could operate autonomously for only seven hours.

Anthropic said Claude Sonnet 4.5 also outperformed Opus on key benchmarks and was more effective in meeting customers’ practical business needs. The company said the model was even better at coding than previous frontier models, and state-of-the-art on SWE-Bench Verified, a key benchmark that tests how models perform at software development

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