Anthropic: Claude Opus 4.5

Anthropic's Claude Opus 4.5, created November 24, 2025, is a frontier reasoning model excelling in complex software engineering and agentic workflows. It demonstrates competitive response times, ranking in the 47th percentile for speed, though it is positioned at a premium pricing level (8th percentile). A standout feature is its exceptional reliability, achieving a 100% success rate across all benchmarks, indicating robust technical stability. Opus 4.5 exhibits strong performance across various categories. It achieves perfect accuracy in General Knowledge and Ethics, with the latter also being the most accurate model at its price point and speed. Coding and Mathematics benchmarks show impressive accuracy at 95% and 96% respectively, placing it in the top decile for these areas. Its Reasoning capabilities are also robust at 98% accuracy. While its Hallucinations accuracy is high at 98%, it's not among the absolute top performers in this specific metric. Instruction Following is strong at 77%, and Email Classification is solid at 98%. The model's ability to operate efficiently across varied effort levels and its new token efficiency parameter are key differentiators for developers.