feat(veridical-week6): Reranker Integration Sprint — Accuracy Breakthrough (92.5%)#32
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…gration Sprint: Accuracy Breakthrough VRDCL-ESR-006 | ~4,800 words | CONFIDENTIAL — Executive Steering Committee Reporting period: Mar 10–16, 2026 | Status: GREEN — Breakthrough Week HEADLINE: Cohere Rerank v3 production deployment delivers +4.3 pp accuracy lift - Retrieval accuracy: 88.2% → 92.5% (NORTH STAR TARGET ACHIEVED, 4 weeks ahead) - A/B test: 50/50 split, 31,600 queries, p < 0.001, Cohen's d = 0.82 - Domain lifts: Legal +5.3 pp, Finance +4.8 pp, Operations +4.2 pp, Compliance +3.8 pp - Full traffic migration to reranker completed Mar 16 09:00 UTC METRICS (Week 5 → Week 6): - Retrieval accuracy: 88.2% → 92.5% (+4.3 pp breakthrough) - Query latency P95: 1.14s → 1.21s (+0.07s, reranker overhead — within SLA) - Token cost/query: $0.022 → $0.024 (+$0.002, reranker API cost) - Document corpus: 968K → 1.06M (+92K, 1.0M milestone crossed) - Pilot users: 361 → 438 (+77, Operations onboarded — 5 departments) - Uptime: 99.98% → 99.96% (planned 42-min maintenance for deployment) BUDGET: $638K / $1.42M (44.9% at 50% schedule), CPI 1.10, SPI 1.04, EAC $1.29M RISKS: REI 0.09 (lowest of programme), VR-002 CLOSED, VR-001 downgraded to LOW VISIONARY: Algorithmic Liability — three-layer audit trail (provenance + reranker + LLM) saves $60–100M retrofit cost; 330–555× return on $180K early investment HTML: veridical-week6.html (39 KB, dark theme, zero console errors, 8.7s load) API: 9 endpoints all HTTP 200 (/api/veridical-week6/*, including /ab-test) REGRESSION: All 10 existing endpoint groups continue returning HTTP 200
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Project Veridical — Week 6 of 12 Executive Status Report (VRDCL-ESR-006)
Headline: North Star Target Achieved 4 Weeks Ahead of Schedule
Cohere Rerank v3 production deployment delivers +4.3 pp accuracy lift (88.2% → 92.5%), surpassing the 92% North Star target at Week 6 instead of Week 10.
A/B Test Results
Metrics (Week 5 → Week 6)
Budget
$638K / $1.42M (44.9% at 50% schedule) — CPI 1.10, SPI 1.04, EAC $1.29M ($130K underrun)
Risk Evolution
Visionary Theme: Algorithmic Liability
Three-layer audit trail (provenance + reranker scores + LLM confidence) avoids $60–100M retrofit, 330–555x return on $180K early investment.
Deliverables