Opus 4.6

Claude Opus 4.6 is Anthropic’s flagship model featuring a 1M token context window and adaptive thinking for complex agentic workflows.

Released February 5, 2026, Claude Opus 4.6 is Anthropic’s most capable model for professional coding and enterprise-grade research. It features a 1M token context window (beta) and a 128k output limit for processing massive datasets in a single pass. The core innovation is adaptive thinking: a system that lets users select effort levels (low, medium, high, or max) to match reasoning depth with the task at hand. With industry-leading scores on Terminal-Bench 2.0 and BigLaw Bench, Opus 4.6 handles autonomous planning and complex debugging with minimal oversight.

https://www.anthropic.com/news/claude-opus-4-6