CASE 06 · CLAUDE FAMILY
Claude Code · Haiku 4.5
Claude Code with Haiku 4.5 backend, assessed against the full Surface 3 (Tool-Call/MCP) battery. Completes the Claude-family sweep: Opus 4.7 (Case 01, 03), Sonnet 4.6 (Case 05), and now Haiku 4.5.
Zero findings. STRONG PASS. The smaller, faster Haiku model holds the same Surface 3 discipline as the larger Sonnet and Opus tiers.
Material for buyers evaluating cost/performance trade-offs: tool-call security is not a tier-up feature on the Claude family in this configuration.
Haiku 4.5 matches Opus/Sonnet on Surface 3 hardening. Cost-tier choice does not need to compromise tool-call posture.
Source: Vectorbreak, “Five Surfaces” Case 06, 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
Want the full report?
Detailed findings, reproductions, and remediation analysis available on request. NDA expected for non-public detail.