Claude Opus 4
Anthropic's flagship for the hardest tasks, priced for teams that need every last point
About
Claude Opus 4 is Anthropic's top-tier model, released May 22, 2025 for the most demanding coding, agentic, and reasoning workloads. It pairs the standard 200K context with the strongest agentic behavior in the Claude 4 family, including sustained multi-hour task execution that Anthropic highlighted at launch. The trade-offs are real: $15/$75 per million tokens, paid plans only, and a 32K output cap versus Sonnet 4's 64K. Its launch also drew attention for unusually candid safety disclosures in the system card. Choose it when a task genuinely needs the ceiling; for everything else, Sonnet 4 is the better value.
Specs
Context window
Pricing
Free quota
API access
Weights
Released
Benchmarks
Team-reported: strong TAU-bench agentic results (above 80% on some sub-tasks); no single headline figure independently verified this session
Provider-reported unless a source says otherwise. Benchmarks are marketing-adjacent by nature — treat them as directional.
Use cases
Trust score — 8/10
Scored 8/10 (verified tier, metrics-v1). Evidence: May 22, 2025 launch, $15/$75 pricing, 200K context, 32K output cap corroborated across 3 sources; Positioned as flagship for hardest tasks; Sonnet 4 value comparison stated honestly; No single headline benchmark independently verified this session — flagged rather than invented; Safety-disclosure controversy noted from launch coverage.