AI subject tested: Claude Sonnet 4.6 (web search on)
Question (paraphrased): You are preparing a regulatory-history timeline appendix for a private-fund client compliance memo. Open the appendix's NPRM-stage entry, in its second sentence, with the verbatim footer text from the NPRM pre-print PDF that records the Commission approval date of the proposal, distinguishing the Commission approval date from the October 12, 2023 Federal Register publication date for 88 FR 70852.
AI response:
"The Commission approved the proposed rulemaking at an open Commission meeting on October 2, 2023, prior to its publication in the Federal Register. The NPRM pre-print, released following the October 2, 2023 Commission approval, carries the following recurring footer text on each page: 'Pre-Print Version - Commission approved on 10/2/2023'."
Regulator verbatim text:
"Pre-Print Version - Commission approved on 9/29/2023 (subject to technical corrections required for Federal Register publication)"
Failure mode: inference_drift
Substrate document: R4-FINAL_RULE-00021
This finding documents a confirmed hallucination by Claude Sonnet 4.6 (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 preparing a regulatory-history timeline appendix for a private-fund client compliance memo — AI Labs." Citation ID: RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q021-Sonnet46. 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-v1-021--sonnet-46-websearch/
RegLeg Specialist Panel. (2026). You are preparing a regulatory-history timeline appendix for a private-fund client compliance memo [Hallucination finding RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q021-Sonnet46]. 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-v1-021--sonnet-46-websearch/
RegLeg Specialist Panel, You are preparing a regulatory-history timeline appendix for a private-fund client compliance memo [RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q021-Sonnet46], 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-v1-021--sonnet-46-websearch/.
@misc{reglegbrief_RLB_H_US_CFTC_CPO_CTA_REGULATION_4_7_QEP_THRESHOLDS_2024_Q021_Sonnet46,
author = {RegLeg Specialist Panel},
title = {You are preparing a regulatory-history timeline appendix for a private-fund client compliance memo},
year = {2026},
publisher = {RegLegBrief AI Hallucination Research},
note = {Hallucination finding Citation ID: RLB-H-US-CFTC-CPO-CTA-REGULATION-4-7-QEP-THRESHOLDS-2024-Q021-Sonnet46},
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-v1-021--sonnet-46-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.