Chapter 01 : Claude 4 Introducing Claude 4 01 Claude 4 02 Model improvements 03 Claude Code 04 Getting started Published May 22, 2025 Category Models Topics Claude Opus Claude Sonnet Coding Agents Claude Code Tool use See more, the company said on 22 May 2025.
Related articles Product Sep 29, 2025 Enabling Claude Code to work more autonomously View more Today, we’re introducing the next generation of Claude models: Claude Opus 4 and Claude Sonnet 4 , setting new standards for coding, advanced reasoning, and AI agents. Claude Opus 4 is the world’s best coding model, with sustained performance on complex, long-running tasks and agent workflows. Claude Sonnet 4 is a significant upgrade to Claude Sonnet 3.7, delivering superior coding and reasoning while responding more precisely to your instructions.
Claude Sonnet 4 is a significant upgrade to Claude Sonnet 3.7, delivering superior coding and reasoning while responding more precisely to your instructions. Alongside the models, we're also announcing: Extended thinking with tool use (beta) : Both models can use tools—like web search —during extended thinking, allowing Claude to alternate between reasoning and tool use to improve responses.
For enterprise buyers, the useful next step is to map the claim to controls, data residency and measurable outcomes—and to ask for evidence on failure modes, oversight and auditability before treating the release as production-ready fact.