Claude Opus 5

Claude Opus 5 has been released as a cost-effective alternative that delivers near-frontier performance at half the price of Claude Fable 5, becoming the default model for Claude Max and Claude Pro. The model achieves state-of-the-art results on coding and knowledge work benchmarks, significantly outperforming its predecessor Opus 4.8 on tasks like software engineering, problem-solving, and scientific research while maintaining the same cost. Opus 5 is designed for efficient daily use with performance gains across evaluations including Frontier-Bench, ARC-AGI 3, and OSWorld 2.0, though it remains behind Mythos 5 on cybersecurity tasks.