Introducing Claude Sonnet 4.5—the best coding model in the world

[claudeai@threads.net]

Introducing Claude Sonnet 4.5—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 on tests of reasoning and math.

[claudeai@threads.net]

We're also releasing upgrades for Claude Code.

The terminal interface has a fresh new look, and the new VS Code extension brings Claude to your IDE.

The new checkpoints feature lets you confidently run large tasks and roll back instantly to a previous state, if needed.

[claudeai@threads.net]

Claude can use code to analyze data, create files, and visualize insights in the files & formats you use. Now available to all paid plans in preview.

We've also made the Claude for Chrome extension available to everyone who joined the waitlist last month.

[claudeai@threads.net]

On the Claude API, we’ve added two new capabilities to build agents that handle long-running tasks without frequently hitting context limits:

- Context editing to automatically clear stale context
- The memory tool to store and consult information outside the context window

[claudeai@threads.net]

Claude Sonnet 4.5 is available everywhere today—on the Claude Developer Platform, natively and in Amazon Bedrock and Google Cloud's Vertex AI.

Pricing remains the same as Sonnet 4.

For more details: https://www.anthropic.com/news/claude-sonnet-4-5