Claude Opus 5 is Anthropic's flagship Opus-tier model, delivering a step-change improvement in coding, agentic workflows, and professional knowledge work. It is particularly strong at end-to-end software engineering, code review, bug finding, and visual analysis, and can power long-running, highly capable agents with minimal oversight. Opus 5 features effort settings that allow users to control how hard the model works, reaching peak performance on the highest-value tasks while running at lower cost when full capability isn't needed. It supports a 1M token context window and is available via the Claude API, Amazon Web Services, Google Cloud, and Microsoft Foundry.