Introducing Claude Sonnet 4.5

Anthropic has launched Claude Sonnet 4.5, a new model with stronger coding, computer-use, reasoning, and math performance.

The company says it is its most capable and most aligned model yet, built to handle long multi-step tasks more reliably.

Anthropic also rolled out updates for Claude Code, Claude apps, and Claude for Chrome, plus a new Claude Agent SDK for developers.

Pricing remains the same as Claude Sonnet 4, and the model is available now through the API and Anthropic products.