Claude Opus 5.5

Claude Opus 5.5 is Anthropic's latest large language model, designed to handle complex reasoning and extended reasoning tasks at enterprise scale. For governance purposes, this matters because newer model versions often introduce different capabilities, risk profiles, and compliance considerations than their predecessors, requiring organizations to reassess policies around data handling, output validation, and audit requirements. Understanding which Claude version is in use helps compliance teams map model behavior to their risk frameworks and ensures appropriate guardrails are applied during deployment.

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Corporate PolicyGlobal2026-09-28

Claude Opus 5.5 Brings Behavioral Changes That Require Governance Review

Anthropic has released Claude Opus 5.5 with always-on extended thinking, updated effort controls, and documented behavioral differences from Claude Opus 5. The release includes guidance on how the model handles safety refusals, unattended agentic runs, and risks from pasted user text. Enterprise teams deploying Claude in agentic or compliance-sensitive workflows must review their prompt design, token limits, and cost controls before relying on existing configurations.

Claude Opus 5.5 Anthropic agentic AI model release prompt injection model change management safeguard controls

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