Anthropic - Claude Opus 4.5

A monumental advancement in AI reasoning, famously becoming the first model to outscore all human candidates on Anthropic's rigorous engineering exam. It excels at complex coding, autonomous agents, and real-world computer use. It introduces a breakthrough progressive compaction method that eliminates conversation length walls, maintaining absolute stability in long-running agent threads. Through a unique API effort parameter, developers can throttle its thinking depth; at maximum effort, it solves highly ambiguous problems with minimal token waste. Opus 4.5 acts as a master coordinator, fluidly managing teams of sub-agents to execute vast architectural software development tasks.