Anthropic: claude-opus-4.6:free

Released on February 5, 2026, Claude Opus 4.6 is Anthropic's frontier model optimized for complex enterprise workflows and high-stakes knowledge work. As a direct successor to Opus 4.5, it introduces a massive 1 million token context window. It is designed to act as an autonomous agent that "nails deliverables on the first try," significantly reducing the need for iterative prompting. Opus 4.6 excels in "Computer Use," long-horizon coding (reigning atop Terminal-Bench 2.0), and professional-grade cybersecurity analysis.