Sonnet 5

Claude Sonnet 5 by Anthropic, released June 30, 2026. Chat with the new model and see everything it can do. Claude Sonnet 5 is Anthropic's newest AI model, released on June 30, 2026 — and Sonnet 5 lets you chat with it right in your browser while you learn exactly what it can do. Here's the full picture of the new model. (Updated June 30, 2026.)

🚀 What is Claude Sonnet 5 Released by Anthropic on June 30, 2026 as the successor to Sonnet 4.6, Claude Sonnet 5 is the most agentic Sonnet model yet. It can plan, reason, and use tools like browsers and terminals — and coordinate subagents — to run autonomously, at a level that just months ago required larger, more expensive models. On launch day it became the default model across Claude's consumer plans (and is available to Max, Team and Enterprise users).

📊 Performance and benchmarks: 💻 Near-Opus 4.8 quality: on agentic coding benchmarks Claude Sonnet 5 scores 63.2%, versus 69.2% for Opus 4.8 and 58.1% for the previous Sonnet 4.6 — and it slightly surpasses Opus 4.8 on some knowledge-work benchmarks. 💻 Self-correcting: the model reviews its own answer and fixes errors before you see it. 🛡️ Safer by design: improved refusal and prompt-injection resistance; both new Sonnet models scored 0.0% on the Firefox 147 exploit benchmark (work done with Mozilla, patched in Firefox 148).

💲 Pricing (as of June 30, 2026): Introductory API pricing is $2 per million input tokens and $10 per million output tokens through August 31, 2026, then $3 / $15 — well below Opus 4.8 ($5 / $25), OpenAI's GPT-5.5, and Google's Gemini 3.1 Pro.

🏁 How it compares: Claude Sonnet 5 is a direct, lower-cost alternative to OpenAI's GPT-5.6 Sol and Google's Gemini 3.5 Flash for everyday agentic tasks, and it powers the same Sonnet-class intelligence available in Claude Code and the Claude Platform and API.

💬 Try the new model in this extension: ⚡️ Chat instantly — no setup, no API keys, no account juggling. ⚡️ Ask anything: questions, explanations, brainstorming, and summaries in a clean chat window. ⚡️ Write and rewrite: emails, posts, code snippets, and ideas in seconds. ⚡️ Understand any page: paste text and let Sonnet 5 explain, translate, or condense it.