claude-4.5-opus

Claude Opus 4.5 is Anthropic's frontier model: State-of-the-art for autonomous agents, complex coding (SWE-bench Verified), and advanced computer control.

This is Anthropic's flagship model, released November 2025, engineered for maximum capability and practical performance. Opus 4.5 excels at long-horizon, agentic workflows and complex software engineering tasks, delivering state-of-the-art results on benchmarks like SWE-bench Verified. Key features include the 'Infinite Chats' mechanism for seamless context management (200,000-token window) and a unique 'effort' parameter (up to 64k tokens) for controlling response thoroughness and token efficiency. Crucially, Anthropic slashed pricing by approximately 67% compared to Opus 4.1, making this premium intelligence accessible for mission-critical deployments ($5/$25 per million tokens).

https://www.claude.ai/