Claude Sonnet 4.6 Now Generally Available in GitHub Copilot with Enhanced Agentic Coding

Claude Sonnet 4.6 Arrives in GitHub Copilot

GitHub announced on February 17, 2026, that Anthropic's Claude Sonnet 4.6 is now generally available and rolling out in GitHub Copilot. Early testing highlights two key strengths: excellence in agentic coding and particularly strong performance in search operations.

What It Means for Developers

Agentic coding excellence: The model excels at complex, multi-step coding tasks executed autonomously, making it ideal for Copilot's agent-mode workflows.

Search operations strength: Navigating codebases and retrieving relevant context is a notable area where Sonnet 4.6 shines.

Developers can try it in VS Code or via the Copilot CLI.

About Claude Sonnet 4.6

Released by Anthropic on February 17, 2026, Claude Sonnet 4.6 is a full upgrade across coding, computer use, long-context reasoning, agent planning, knowledge work, and design. It achieves 79.6% on SWE-bench Verified and 72.5% on OSWorld. Pricing remains unchanged from Sonnet 4.5 at $3/$15 per million tokens, and a 1M token context window is available in beta.