Anthropic Releases Claude Opus 4.6 with Million-Token Context

Anthropic launched Claude Opus 4.6, introducing a one-million-token context window in beta and effort controls giving developers granular choice over intelligence, speed, and cost tradeoffs across four effort levels. Claude Sonnet 4.6 followed on February 17 with improved coding capabilities. The Model Context Protocol (MCP), Anthropic's open standard for connecting AI to external tools, crossed 97 million installs in March.