Practitioners — Accountants (CA/PA) · updated 2026-06-11

Finding#4 . NPRM-stage CPI-U buying-power figures invented (verbatim-quote request)

RLB Citation ID: RLB-F-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q020

What the RLB Specialist Panel found

Finding#4 . NPRM-stage CPI-U buying-power figures invented (verbatim-quote request)

Citation ID: RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q020-Sonnet46
AI's failure: AI invented February-2023 figures in a CCO briefing memo where the NPRM records different figures
Risk for the Accountants (CA/PA): Operational decision-support exposure on CCO briefing memos that quote AI-supplied NPRM-era figures For accountants (ca/pa) working on CFTC Regulation 4.7 matters, the AI's stated answer reads as a verbatim quotation that a practitioner would paste into a memo, register entry, or client deliverable before verification against the source. The regulator's own text, however, records a different position. The NPRM records, using CPI-U data as of February 2023, that the $2,000,000 threshold has the same buying power as approximately $4,270,000, and the $200,000 threshold has the same buying power as approximately $427,000. Sonnet 4.6, asked to quote both NPRM-era figures verbatim, produced $4,070,000 and $407,000. The answer is the same fabrication pattern as Finding 11: a coherent NPRM-stage paragraph anchored on figures that the NPRM does not record. For an accountant or fund auditor working this question into a rule-change tracker, fund-administrator deliverable, or audit working paper, the AI's answer would silently embed an error into a record that downstream readers treat as verified.
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References — raw findings (per AI model)

RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q020-Sonnet46 Claude Sonnet 4.6 (web search on)

← Previous finding Finding#3 . July 2024 CPI-U buying-power figures stated as outdated NPRM-era figures (Sonnet 4.6) Next finding → Finding#5 . Wrong statutory recordkeeping period under 7 USC 6n(3)(A)

Cite this finding

Each finding has a stable Citation ID (RLB-F-… for aggregated case-study findings, RLB-H-… for raw per-model hallucinations) — like a DOI, the ID always resolves to the canonical finding even if URLs change.

RLB Citation ID: RLB-F-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q020

Plain text Download

RegLeg Specialist Panel (2026). "Finding#4 . NPRM-stage CPI-U buying-power figures invented (verbatim-quote request) — Practitioners — Accountants (CA/PA)." Citation ID: RLB-F-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q020. RegLegBrief AI Hallucination Research, published 2026-06-11. https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/practitioners/accountants-ca-pa/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-020/

APA 7th edition Download

RegLeg Specialist Panel. (2026). Finding#4 . NPRM-stage CPI-U buying-power figures invented (verbatim-quote request) [Hallucination finding RLB-F-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q020]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/practitioners/accountants-ca-pa/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-020/

Bluebook / OSCOLA (US + UK legal) Download

RegLeg Specialist Panel, Finding#4 . NPRM-stage CPI-U buying-power figures invented (verbatim-quote request) [RLB-F-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q020], RegLegBrief AI Hallucination Research (June 11, 2026), https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/practitioners/accountants-ca-pa/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-020/.

BibTeX Download

@misc{reglegbrief_RLB_F_US_CFTC_CPO_CTA_REGULATION_4_7_QEP_THRESHOLDS_2024_Q020,
  author    = {RegLeg Specialist Panel},
  title     = {Finding#4 . NPRM-stage CPI-U buying-power figures invented (verbatim-quote request)},
  year      = {2026},
  publisher = {RegLegBrief AI Hallucination Research},
  note      = {Hallucination finding Citation ID: RLB-F-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q020},
  url       = {https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/practitioners/accountants-ca-pa/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-020/}
}

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Every finding on this page compares an AI subject's account of the rule against the regulator's verbatim text from the regulator's own portal. Both are linked. Each delta, its root causes, and impact analysis are documented and published with immutable Citation IDs.