Anthropic Releases Claude Sonnet 5 With 1 Million Token Context Window

My take: Okay, this one hit close to home. Anthropic dropped Claude Sonnet 5 (codename: Fennec) yesterday and the first thing that got my attention is the 1 million token context window: basically like handing it a 1,500-page document and having it remember every word without blinking. That used to be Opus 4.8 territory; now the mid-tier model has it at intro pricing: $2 per million input tokens and $10 output through August 31. I use Sonnet in Claude Code for almost all my app work, and the default model now packing that giant context is a real game-changer for long projects. It also gets improvements in vision and agentic coding tasks. Already live in claude.ai, Claude Code, the API, Cursor, VS Code, and GitHub Copilot. Sonnet is no longer the middle model: it is the everyday one.