Claude Opus 5.5

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Corporate Policy2026-09-23

Claude Opus 5.5 Cuts Cost 40% and Adds Dual-Use Verification Programs

Anthropic released Claude Opus 5.5 on September 22, 2026, a frontier model priced 40% below its predecessor. The release introduces formal verification programs for biology and cybersecurity use cases. External evaluators including Frontier Design and METR tested the model before release.

Claude Opus 5.5 Anthropic dual-use AI agentic AI red teaming vendor verification life sciences cybersecurity