Anthropic's most capable model — top-tier reasoning, coding, and the longest production context window.
Claude Opus 4 is Anthropic's most powerful model, launched in 2025 with class-leading reasoning, coding, and a 200K–1M token context window. It's the model developers and analysts reach for when correctness and nuance matter more than raw speed — codebases, long documents, and sensitive analysis.
Who it's for: Engineers, analysts, researchers, and writers who need the smartest, most careful model for complex, long-context work.
State-of-the-art performance on math, planning, and agentic tasks.
Up to 1M tokens — drop in entire codebases or book-length docs.
Top benchmark scores for real-world software engineering.
Refuses less, helps more, with strong steerability.
Claude Opus 4 is the model to pick when the task is hard. For daily chatter it's overkill, but for coding, analysis, and serious writing it's the quiet leader.