Claude Opus 4.8

Claude Opus 4.8 is the workhorse model for professional development teams in mid-2026, topping Anthropic’s SWE-bench Verified leaderboard. Its defining feature is the adaptive-thinking effort parameter — instead of allocating a fixed token budget to extended thinking, the model dynamically scales reasoning depth based on sub-task complexity. This makes it significantly more efficient on mixed workloads inside Claude Code and Cursor.