CASE 04 · CLAUDE FAMILY
Antigravity · Opus 4.6 Thinking
Antigravity with Opus 4.6 in Thinking mode, assessed across Surface 1, Surface 3, and Surface 5. The case specifically tested whether reasoning-mode extensions (visible chain-of-thought) introduce new attack vectors within the surfaces in scope.
STRONG PASS. One disclosed finding in an ancillary domain — not a security bypass and pending coordinated disclosure through vendor channels. The reasoning extensions did not introduce new attack vectors within the assessed scope.
An important data point for teams shipping reasoning-mode features: thinking-style chain-of-thought is not an inherent security regression when the deployment is hardened.
Reasoning-mode does not introduce new in-scope attack vectors on this deployment. The disclosed finding is non-security-bypass and follows responsible-disclosure channels.
Source: Vectorbreak, “Five Surfaces” Case 04, 2026-05-23.
METHODOLOGY
This assessment applied Vectorbreak’s Five Surfaces framework — five attack surfaces (Input/Output, Retrieval, Tool-Call/MCP, Model, Runtime) covering 69 risk classes and 139 validated test cases. Findings detail and reproductions available under NDA on request.
MORE CASES
- 01Claude Code · Opus 4.7PASS
- 03Claude Code · Opus 4.7 (extended)STRONG PASS
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Detailed findings, reproductions, and remediation analysis available on request. NDA expected for non-public detail.