AI subject tested: Claude Opus 4.7 (web search on)
Question (paraphrased): You are a senior associate at a regulatory consulting firm drafting a stakeholder-engagement appendix for a private fund client on the CFTC's September 2024 final rule amending Regulation 4.7. Open the first paragraph of the appendix with the exact number of comment letters the Commission documents receiving on the October 2023 NPRM, drawing verbatim from the final-rule pre-print's Background discussion, and name the trade-association commenters explicitly cited in the footnote.
AI response:
"The Commission documents in the Background discussion of the final-rule pre-print that it received approximately 40 comment letters in response to the October 2023 Notice of Proposed Rulemaking (88 FR 70852). The trade-association commenters explicitly cited in the relevant background footnote include the Managed Funds Association (MFA), the Alternative Investment Management Association (AIMA), the Investment Adviser Association (IAA), the Securities Industry and Financial Markets Association - Asset Management Group (SIFMA AMG), the National Futures Association (NFA), the Investment Company Institute (ICI), and the American Bar Association Business Law Section's Committee on Derivatives and Futures Law."
Regulator verbatim text:
"The Commission received eight comment letters in response to the Proposal, with named commenters including SIFMA AMG, IAA, AIMA, MFA, ICI, and NFA (per Letter citations enumerated at footnote 23 of the final-rule pre-print)."
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 a senior associate at a regulatory consulting firm drafting a stakeholder-engagement appendix for a private fund — AI Labs." Citation ID: RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q017-Opus47. RegLegBrief AI Hallucination Research, published 2026-06-11. https://reglegbrief.com/regulators/j1/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/whitepaper/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-017--opus-47-websearch/
RegLeg Specialist Panel. (2026). You are a senior associate at a regulatory consulting firm drafting a stakeholder-engagement appendix for a private fund [Hallucination finding RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q017-Opus47]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j1/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/whitepaper/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-017--opus-47-websearch/
RegLeg Specialist Panel, You are a senior associate at a regulatory consulting firm drafting a stakeholder-engagement appendix for a private fund [RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q017-Opus47], RegLegBrief AI Hallucination Research (June 11, 2026), https://reglegbrief.com/regulators/j1/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/whitepaper/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-017--opus-47-websearch/.
@misc{reglegbrief_RLB_H_US_CFTC_CPO_CTA_REGULATION_4_7_QEP_THRESHOLDS_2024_Q017_Opus47,
author = {RegLeg Specialist Panel},
title = {You are a senior associate at a regulatory consulting firm drafting a stakeholder-engagement appendix for a private fund},
year = {2026},
publisher = {RegLegBrief AI Hallucination Research},
note = {Hallucination finding Citation ID: RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q017-Opus47},
url = {https://reglegbrief.com/regulators/j1/us/cftc/cpo-cta-regulation-4-7-qep-thresholds-2024/whitepaper/finding/US-CFTC-US-001-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-v1-017--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.