Introducing Claude Sonnet 5

Overview

Our most agentic Sonnet yet, with top-tier intelligence for coding and everyday professional work. Product Introducing Claude Sonnet 5 Jun 30, 2026 Claude Sonnet 5 is built to be the most agentic Sonnet model yet. It can make plans, use tools like browsers and terminals, and run autonomously at a level that, just a few months ago, required larger and more expensive models.

Key Takeaways

For many developers, the agentic AI era began with Sonnet-class models: Claude Sonnet 3.5, 3.6, and 3.7 were the first models that showed impressive skills in coding and tool use.
More recently, though, the clearest gains in agentic capabilities have been in our Opus-class models.
It's also available in Claude Code and on the Claude Platform, where it launches with introductory pricing of $2 per million input tokens and $10 per million output tokens through August 31, 2026, after which it will be priced at $3 per million input tokens and $15 per million output tokens.
Agentic search Agentic computer use Feedback from our early access partners has been consistent: Sonnet 5 is much more agentic than its predecessors.
Same output quality, fewer steps to get there.
Unprompted, it wrote a reproducing test, implemented the fix, then stashed it to confirm the bug came back without the change.

Stats & Key Facts

#Product Introducing Claude Sonnet 5 Jun 30, 2026 Claude Sonnet 5 is built to be the most agentic Sonnet model yet.
#It's also available in Claude Code and on the Claude Platform, where it launches with introductory pricing of $2 per million input tokens and $10 per million output tokens through August 31, 2026, after which it will be priced at $3 per million input tokens and $15 per million output tokens.

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Originally published by Anthropic

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