Anthropic Launches Claude Opus 4.1: 50% Cost Reduction, Top-Tier Reasoning Performance

Anthropic officially released Claude Opus 4.1, the most cost-effective version to date. Opus 4.1 scores 72.8% on SWE-bench (coding tasks), surpassing all open-source models and matching GPT-4o. Meanwhile, API pricing drops from $15 to $7.50 per million tokens, a 50% reduction. More importantly, Opus 4.1 introduces a 'Progressive Reasoning' mode, allowing agents to verify and correct intermediate results in real-time during reasoning, improving accuracy by 23% compared to traditional one-shot output. Cursor and Windsurf have announced they will use Opus 4.1 as the default backend.