Hello,

Hello,

Today, we’re introducing Claude Opus 4 and Claude Sonnet 4, setting new standards for coding, advanced reasoning, and AI agents.

Here’s what we’re launching on the Anthropic API:
• Claude Opus 4: The world’s best coding model, with sustained performance on complex, long-running tasks and agent workflows.
• Claude Sonnet 4: A significant upgrade to Claude Sonnet 3.7, surpassing its predecessor across coding and reasoning while responding more precisely to your instructions.
• Extended thinking with tool use (beta): Both models can use tools during extended thinking, allowing Claude to alternate between reasoning and tool use to improve responses.
• New model capabilities: When given local file access, both models can now extract and save key facts from conversations into local ‘memory files,’ maintaining continuity across sessions and building tacit knowledge over time. We’ve also added parallel tool use and improved instruction following.
• New API capabilities: We’re releasing four new capabilities on the Anthropic API that enable developers to build more powerful AI agents–the code execution tool, MCP connector, Files API, and the ability to cache prompts for up to one hour.
• Priority Tier: You can now purchase prioritized API capacity for predictable availability during high-demand periods.