Claude Opus 4.5 (latest)

Claude Opus 4.5 sits at the top of Anthropic's Claude family and is positioned as the flagship option for deep reasoning, software engineering, and long-horizon agent tasks that demand sustained, multi-step planning. Within the Opus 4.5 release there is a thinking configuration alongside the default variant, and the two show a clear separation on independent intelligence benchmarks: the thinking variant reaches an Artificial Analysis Intelligence Index score of 33.6, while the non-thinking configuration scores 27.8, indicating that extended internal reasoning delivers a substantial uplift on aggregated reasoning evaluations.

In practical preference benchmarks mirrored from OpenRouter, Claude Opus 4.5 records a Design Arena 3D score of 1251, an Android-native score of 1197, and an ASCII art score of 1213, giving a consistent signal of strong output quality across visually structured and UI-oriented generation tasks. Together, these results suggest Claude Opus 4.5 is best suited to workloads where careful reasoning, code synthesis, and visually aware generation intersect, such as building agentic coding assistants, complex analytical workflows, and design-oriented applications that benefit from a thinking-mode option.