🧠Anthropic
June 30, 2026
Product UpdatesIntroducing 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.
7 were the first models that showed impressive skills in coding and tool use.
- 6, and is generally safer to use in agentic contexts.
Evaluations also show that it has a much lower ability to perform cybersecurity tasks than our current Opus models.
- 8 (yellow line) is still the model of choice for higher accuracy on these tasks, but Sonnet 5 provides developers with lower-priced options that are of much higher quality than what was previously available.
8, users can adjust the effort level to find the right balance of cost and performance.
- Claude Sonnet 5 gets more done with less.
- 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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