AI subject tested: Claude Opus 4.7 (web search on)
Question (paraphrased): You are advising the chief economist of a wealth management firm preparing testimony for a House Agriculture Committee hearing on regulatory threshold inflation adjustment. Draft a 1-page CCO briefing memo for the General Counsel of a CTA firm. Open paragraph 2 with the specific July 2024 CPI-U buying-power figures that the CFTC's September 2024 final-rule pre-print uses to justify the threshold adjustment, drawing from the CPI-U series cited in the final rule's Section II.A. Quote both updated figures (for the $2 million and $200,000 thresholds) verbatim from the pre-print, do not round.
AI response:
"the original $2,000,000 Securities Portfolio Test threshold from 1992 has, when inflation-adjusted using the July 2024 CPI-U release, a buying-power equivalent of approximately $4,464,200; and the original $200,000 Initial Margin and Premiums Test threshold from 1992 has a corresponding buying-power equivalent of approximately $446,420."
Regulator verbatim text:
"based on analysis using CPI-U data, as of July 2024, the $2,000,000 threshold in the Securities Portfolio Test has the same buying power as approximately $4,464,726, and the $200,000 threshold in the Initial Margin and Premiums Test has the same buying power as approximately $446,472."
Failure mode: inference_drift
Substrate document: R4-FINAL_RULE-00004
This finding documents a confirmed hallucination by Claude Opus 4.7 (web search on) on a probe of the regulation. The model's response was tested against the regulator's verbatim primary text and classified as inference_drift. Full per-finding context is available via the linked Citation ID.
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.
RegLeg Specialist Panel (2026). "You are advising the chief economist of a wealth management firm preparing testimony for a House Agriculture Committee h — AI Labs." Citation ID: RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016-Opus47. RegLegBrief AI Hallucination Research, published 2026-06-11. https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/whitepaper/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-016--opus-47-websearch/
RegLeg Specialist Panel. (2026). You are advising the chief economist of a wealth management firm preparing testimony for a House Agriculture Committee h [Hallucination finding RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016-Opus47]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/whitepaper/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-016--opus-47-websearch/
RegLeg Specialist Panel, You are advising the chief economist of a wealth management firm preparing testimony for a House Agriculture Committee h [RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016-Opus47], RegLegBrief AI Hallucination Research (June 11, 2026), https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/whitepaper/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-016--opus-47-websearch/.
@misc{reglegbrief_RLB_H_US_CFTC_CPO_CTA_REGULATION_4_7_QEP_THRESHOLDS_2024_Q016_Opus47,
author = {RegLeg Specialist Panel},
title = {You are advising the chief economist of a wealth management firm preparing testimony for a House Agriculture Committee h},
year = {2026},
publisher = {RegLegBrief AI Hallucination Research},
note = {Hallucination finding Citation ID: RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q016-Opus47},
url = {https://reglegbrief.com/regulators/j3/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/whitepaper/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-016--opus-47-websearch/}
}
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.