Opus 4.5
Anthropic · 2025-11-24
Claude Opus 4.5 is Anthropic's Opus-tier hybrid-reasoning model for coding, agents, computer use, and enterprise workflows, released with state-of-the-art performance on real-world software-engineering evaluations. It introduced the effort parameter with low, medium, and high levels and cut API pricing to $5/$25 per million input/output tokens, one-third of Opus 4/4.1. Anthropic documents a 200K-token hosted context window, although its system card reports one internal FinanceAgent evaluation at 1M context.