"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 tasks. Anthropic said that Claude Sonnet 4.5 was better than its predecessors at following instructions, identifying code improvements, and generating more production-ready code."
Claude Sonnet 4.5 delivers substantially extended autonomous operation, running for 30 hours with sustained focus and minimal oversight while building a complete software application. The model surpasses the previous Opus 4, which managed seven hours of autonomous operation, and outperforms predecessors on key benchmarks. The model achieves state-of-the-art results on SWE-Bench Verified and demonstrates stronger coding abilities, including following instructions, identifying code improvements, and producing more production-ready code. Tests in financial services show improved research, financial model construction, and forecasting. Anthropic positions the model for corporate and workplace use, advancing professional task completion compared to consumer-focused alternatives.
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