AI Model
Claude Opus 4.6
byAnthropic
Released on February 5, 2026
Release Summary
Major update with 1M token context window (beta), improved coding and debugging capabilities, enhanced reasoning with adaptive thinking, and new agent teams feature in Claude Code.
Timeline
February 5, 2026
Claude Opus 4.6 released
Anthropic releases Opus 4.6 with 1M context window support, improved coding abilities, and new features like adaptive thinking and effort controls in the API.
February 4, 2026
Opus 4.6 leaks surface on Reddit
Users discover 'claude46opus' identifier in Perplexity's code, sparking speculation about imminent release timed with Anthropic's Super Bowl ad.