Anthropic Expands Cyber Verification Program to Three Access Tiers

Anthropic on October 6, 2026 announced an expanded Cyber Verification Program that makes advanced cyber capabilities and reduced blocking classifiers available to qualifying security professionals across three access tiers. Each tier includes access to Claude Opus 5.5, Claude Sonnet 5.5, Claude Mythos 5.1, and new models going forward. Anthropic described cybersecurity as inherently dual use, saying the same capabilities that let a security team find and fix a vulnerability can also help a malicious actor exploit it.

The company said its generally available models, including Claude Opus 5.5, Claude Fable 5.1, and Claude Sonnet 5.5, carry conservative cyber safeguards that block most cyber work, an approach it said is intended to limit harmful activity by malicious actors while it works to reduce false positives for secure coding. For the six months preceding the announcement, Anthropic provided trusted access through two programs: Project Glasswing, which gave organizations securing critical software access to Claude Mythos, and the original Cyber Verification Program, which gave vetted security teams reduced safeguards on Claude Opus and Claude Sonnet models.

The two programs are now integrated into…