ZH
Brightstead
Check. Review. Record.
AI verification & evidence review
Brightstead Technologies
Description of product
ZH helps organizations check AI-generated work against their sources, flag unsupported claims and keep a reviewable record. It supports workflows that use open-weight models for routine work and reserve frontier models for deeper analysis.
Integration / model flexibility
Can be integrated into existing document and data review workflows.
Supports review of outputs from open-weight and commercial models through configured integrations.
Key capabilities
Citation, quotation and supported calculation checks.
Clear findings for passed, conflicting and unverified claims.
Links between supported findings and source evidence.
Signed verification records and checks for later changes.
Repeatable checks when required inputs are retained.
Example applications
Documents
Proposals
Research
Audit review
PRODUCTION VERIFICATION RECORD
Over 11.6M records reviewed in production and over 26.9M issues flagged as unsupported or wrong.
11.6M+
Records reviewed in production11,665,636 records reviewed by ZH
26.9M+
Issues flagged as unsupported or wrong26,917,447 issues flagged by ZH
8.5M+
Records with at least one issue flagged8,530,856 records
As of .
ZH reviewed these records during production database ingestion, flagging and helping correct errors. A record can contain multiple flagged issues.
Preliminary detection results
96.3%
Standard planted errors detected208/216; model-only review: 185/216 (85.6%).
75.3%
Harder adversarial errors detected338/449 errors written to blend in with the documents.
The same AI reviewing its own work: 53%.
Same 449 planted errors, same scorer.
The same AI reviewing its own work: 53%.
Same 449 planted errors, same scorer.
Internal development tests, Oct 14, 2026. Standard set: 118 documents. Held-out multi-model testing and lawyer review pending.
Model suitability, cost and reliability depend on the workload, evidence quality and configured checks.
Production verification source SHA-256: a6e6355b82468f3e5500e70d5d2c0d5cc28875798450828de71d2497f7d52b69
Preliminary benchmark evidence SHA-256: 82396b9b42745fd927b8ddc41a1a70f833dcc3bc5663d1d01f85a9e0fdffc244
Production verification source SHA-256: a6e6355b82468f3e5500e70d5d2c0d5cc28875798450828de71d2497f7d52b69
Preliminary benchmark evidence SHA-256: 82396b9b42745fd927b8ddc41a1a70f833dcc3bc5663d1d01f85a9e0fdffc244
Specification draft / preliminary benchmarks