Claude Opus 4.5

Claude Opus 4.5 is built for complex tasks like large codebase edits, deep data analysis, and long-form writing, while using fewer tokens than previous Opus or Sonnet 4.5 at similar or better quality. It supports strong tool use and agent workflows, handles long context reliably, and lets you adjust effort so you can trade speed for more careful thinking when needed. Safety is tightened as well, with better resistance to prompt injection and lower rates of risky behavior, making it suitable for higher stakes applications.