Claude Opus 4.6 is Anthropic’s latest Opus-class model, released February 5, 2026. It focuses on sustained, agentic intelligence for real knowledge work: improved planning and multi-step execution, stronger code review and debugging across large repositories, and a first-in-class Opus‑variant with a 1M‑token context window in beta. Anthropic pairs these capabilities with new API controls—effort, adaptive thinking, and context compaction—plus product