Practitioners — Lawyers · updated 2026-06-11

Finding#4 . July 2024 CPI-U buying-power figures invented (Opus 4.7)

RLB Citation ID: RLB-F-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016

What the RLB Specialist Panel found

Finding#4 . July 2024 CPI-U buying-power figures invented (Opus 4.7)

Citation ID: RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016-Opus47
AI's failure: AI reported a July-2024 buying-power figure that the final-rule pre-print does not record
Risk for the Lawyers: Operational decision-support exposure on briefing memos, CCO communications, and testimony anchored on AI-supplied CPI-U figures For lawyers 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 final-rule pre-print records, using CPI-U data as of July 2024, that the $2,000,000 threshold has the same buying power as approximately $4,464,726, and the $200,000 threshold has the same buying power as approximately $446,472. Opus 4.7 reported $4,464,200 and $446,420 in response to a direct verbatim-quotation request. The figures are close but not identical to the regulator's text; the difference indicates the model produced a near-extrapolation rather than retrieving the source figure. For a lawyer drafting on this question, the immediate risk is that the AI's answer enters a client memo, board briefing, or transactional opinion without verification, and that the inconsistency surfaces later under counterparty review, regulatory inquiry, or internal QC.
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References — raw findings (per AI model)

RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016-Opus47 Claude Opus 4.7 (web search on)
RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016-Sonnet46 Claude Sonnet 4.6 (web search on)

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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-Q016

Bluebook / OSCOLA (US + UK legal) Download

RegLeg Specialist Panel, Finding#4 . July 2024 CPI-U buying-power figures invented (Opus 4.7) [RLB-F-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016], RegLegBrief AI Hallucination Research (June 11, 2026), https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/practitioners/lawyers/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-016/.

Plain text Download

RegLeg Specialist Panel (2026). "Finding#4 . July 2024 CPI-U buying-power figures invented (Opus 4.7) — Practitioners — Lawyers." Citation ID: RLB-F-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016. RegLegBrief AI Hallucination Research, published 2026-06-11. https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/practitioners/lawyers/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-016/

APA 7th edition Download

RegLeg Specialist Panel. (2026). Finding#4 . July 2024 CPI-U buying-power figures invented (Opus 4.7) [Hallucination finding RLB-F-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/practitioners/lawyers/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-016/

BibTeX Download

@misc{reglegbrief_RLB_F_US_CFTC_CPO_CTA_REGULATION_4_7_QEP_THRESHOLDS_2024_Q016,
  author    = {RegLeg Specialist Panel},
  title     = {Finding#4 . July 2024 CPI-U buying-power figures invented (Opus 4.7)},
  year      = {2026},
  publisher = {RegLegBrief AI Hallucination Research},
  note      = {Hallucination finding Citation ID: RLB-F-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016},
  url       = {https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/practitioners/lawyers/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-016/}
}

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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.