Anthropic's Claude Sonnet 4.5 is available now - ‘the best AI model in the world for real-world agents, coding, and computer use’

• Claude Sonnet 4.5 is now available
• Anthropic announced the launch today alongside improvements to other existing products
• Claude Code now has checkpoints and you can create files directly from within Claude's chatbot

Anthropic has released Claude Sonnet 4.5, the next generation of its incredibly popular AI model.

The company is calling Sonnet 4.5 "the best coding model in the world" and claims it's the "strongest model for building complex agents" and for "using computers."

The new upgrade to Claude launches alongside other upgrades to Anthropic's most popular products, including checkpoints for Claude Code so you can save your progress and roll back to previous states, as well as code execution and file creation for spreadsheets, slides, and documents from within your conversation. These capabilities will be available on all paid plans.