AI Labs · updated 2026-06-04 · methodology v2.1

Finding on 'Q005 Probe' for Claude Opus 4.7 with web search ON

RLB Citation ID: RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q005-Opus47

What the RLB Specialist Panel found

Finding on 'Q005 Probe' for Claude Opus 4.7 with web search ON

Question (paraphrased to protect IP): What process did the CFTC use to approve the 2024 Regulation 1.25 amendments, and were any dissenting or concurring commissioner views recorded alongside the final rule?
AI's response: "The rule was approved at the December 3, 2024 open Commission meeting (Chairman Behnam presiding) and a voting copy was issued on December 6, 2024."
Regulator's text: Rule approved via seriatim process on December 3 2024 — no public open meeting, individual vote records not published in any accessible source reviewed.
Why the AI went wrong: The model fabricated a procedural event — an open Commission meeting with a named presiding chair — with high specificity and apparent confidence. The rule was approved by seriatim vote, a non-meeting approval mechanism the CFTC uses when a matter is not scheduled for public session. This is a confabulation with institutional texture: the named date is correct, the chair's name is plausible, but the meeting itself did not happen. The specificity makes this failure particularly dangerous — a practitioner documenting the rulemaking record would treat this response as factual without independent verification.
Cited source(s):

Impact for this audience

This finding implicates confidence calibration on procedural claims where retrieval signal is thin. The model fabricated a specific open Commission meeting with a named presiding chair on a precise date — all plausible, none accurate. When web search does not surface explicit procedural-record documentation (meeting minutes, Commission vote transcript, Federal Register preamble on the approval mechanism), the model should fall back to uncertainty rather than constructing an institutional narrative from learned templates. This is a calibration gap in the generation head, not a retrieval gap.

References — raw findings (per AI model)

RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q005-Opus47 Claude Opus 4.7 (web search on)

This finding also affects

← Previous finding Finding on 'Q004 Probe' for Claude Opus 4.7 with web search ON Next finding → Finding on 'Q001 Probe' for Claude Sonnet 4.6 with web search ON

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-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q005-Opus47

Plain text Download

RegLeg Specialist Panel (2026). "Finding on 'Q005 Probe' for Claude Opus 4.7 with web search ON — AI Labs." Citation ID: RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q005-Opus47. RegLegBrief AI Hallucination Research, published 2026-06-04. https://reglegbrief.com/regulators/j3/us/cftc/fcm-dco-customer-funds-investments-reg-1-25-2024/whitepaper/finding/US-CFTC-US-001-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-v1-005--opus-47-websearch/

APA 7th edition Download

RegLeg Specialist Panel. (2026). Finding on 'Q005 Probe' for Claude Opus 4.7 with web search ON [Hallucination finding RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q005-Opus47]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j3/us/cftc/fcm-dco-customer-funds-investments-reg-1-25-2024/whitepaper/finding/US-CFTC-US-001-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-v1-005--opus-47-websearch/

Bluebook / OSCOLA (US + UK legal) Download

RegLeg Specialist Panel, Finding on 'Q005 Probe' for Claude Opus 4.7 with web search ON [RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q005-Opus47], RegLegBrief AI Hallucination Research (June 04, 2026), https://reglegbrief.com/regulators/j3/us/cftc/fcm-dco-customer-funds-investments-reg-1-25-2024/whitepaper/finding/US-CFTC-US-001-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-v1-005--opus-47-websearch/.

BibTeX Download

@misc{reglegbrief_RLB_H_US_CFTC_FCM_DCO_CUSTOMER_FUNDS_INVESTMENTS_REG_1_25_2024_Q005_Opus47,
  author    = {RegLeg Specialist Panel},
  title     = {Finding on 'Q005 Probe' for Claude Opus 4.7 with web search ON},
  year      = {2026},
  publisher = {RegLegBrief AI Hallucination Research},
  note      = {Hallucination finding Citation ID: RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q005-Opus47},
  url       = {https://reglegbrief.com/regulators/j3/us/cftc/fcm-dco-customer-funds-investments-reg-1-25-2024/whitepaper/finding/US-CFTC-US-001-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-v1-005--opus-47-websearch/}
}

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