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Opus 5 is Anthropic’s next-generation flagship within DeepMask and the new ceiling of the Opus line. It is a generational step beyond the Opus 4 series, built for sustained autonomous work, deep multi-document reasoning, and complex multi-agent systems — while keeping the accuracy and long-horizon coherence that demanding, high-stakes tasks require.

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About Opus 5

Opus 5 (released August 26, 2026) replaces the discrete effort toggles of the Opus 4 series with Continuous Reasoning, which allocates thinking depth dynamically per step instead of per request. It reaches a GPQA Diamond score of 96.2%, handles context windows up to 5M tokens with persistent cross-session memory, and introduces native multi-agent orchestration — spinning up, coordinating, and load-balancing fleets of sub-agents without external frameworks. Combined with real-time self-verification carried over from Opus 4.8, it is the strongest option in DeepMask for mission-critical research, security, and large-scale engineering.

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Key Capabilities

Continuous Reasoning

Allocates thinking depth dynamically per step rather than per request — deep where a problem is hard, fast where it is routine, without manual effort settings.

Native Multi-Agent Orchestration

Spins up, coordinates, and load-balances fleets of sub-agents natively — ideal for parallel research, security investigations, and large-scale refactors.

5M Context with Persistent Memory

Reasons over up to 5M tokens and retains verified state across sessions, so long-running agents resume exactly where they left off.

Real-Time Self-Verification

Audits its own intermediate reasoning as it works and reasons natively over text, images, and structured data to catch errors before they propagate.

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Best For

Choose Opus 5 for the most demanding work in your stack: multi-day autonomous engineering, enterprise-scale research across huge document sets, and multi-agent systems that coordinate many tools in parallel. It is the right pick when accuracy, long-horizon coherence, and self-directed effort matter more than cost or latency. For routine tasks, or where cost efficiency is the priority, Opus 4.5–4.8 or Sonnet 4.6 remain strong, lower-cost options.

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Use Cases

  • Multi-agent systems — Orchestrate fleets of coordinated sub-agents for parallel research, QA, and tool use from a single prompt.
  • Enterprise-scale research — Synthesize across 5M tokens of reports, filings, and technical material with persistent memory.
  • Autonomous engineering — Plan, implement, test, and iterate on large codebases over multi-day sessions with resumable state.
  • Cybersecurity defense — Run end-to-end vulnerability investigations with real-time self-verification of each step.
  • High-stakes analysis — Legal, financial, and scientific discovery where edge-case reasoning and multi-step verification are mandatory.

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Specifications

Try Opus 5 in DeepMask →