New Delhi: Anthropic has rolled out Claude Sonnet 4.5, and the pitch is big. The company says this model can handle serious coding work, run for long stretches, and use a computer like a careful assistant. We spent the morning going through the docs and updates. The thing that stood out to us is how much of this release is about real work, not just flashy demos.

Anthropic is calling it a leap in coding, agent building, and safe behavior. The blog opens with a bold line. “Claude Sonnet 4.5 is the best coding model in the world. It’s the strongest model for building complex agents. It’s the best model at using computers. And it shows substantial gains in reasoning and math.” That sets the tone for everything else.

What is Claude Sonnet 4.5

Anthropic says Sonnet 4.5 leads on SWE-bench Ver

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