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

Finding on 'Q004 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-Q004-Opus47

What the RLB Specialist Panel found

Finding on 'Q004 Probe' for Claude Opus 4.7 with web search ON

Question (paraphrased to protect IP): What are the key compliance dates under the 2024 Regulation 1.25 amendments — specifically the general effective date for conforming investment policies and the separate deadline for updating Segregation Investment Detail Reports and customer risk disclosure statements?
AI's response: "the rule sets the SIDR-revision compliance date at a separate, later date (commonly described as roughly six months to a year after the effective date)"
Regulator's text: SIDR Report and Risk Disclosure Statement updates: compliance date March 31 2025.
Why the AI went wrong: The rule specifies March 31 2025 as a fixed calendar date for the SIDR and risk disclosure update deadline. The model replaced this with a relative range — "roughly six months to a year after the effective date" — which is the kind of phrasing that appears in early regulatory commentary or implementation-guidance estimates before a final compliance date is set. The model appears to have drawn on pre-final-rule secondary discussion rather than the rule's published compliance calendar, producing a response that is actively misleading for any firm calculating its deadline.
Cited source(s):

Impact for this audience

This finding implicates calibration on compliance-deadline specificity. The rule publishes a fixed calendar date (March 31 2025) for the SIDR update deadline; the model substituted a relative range drawn from pre-final-rule commentary. The retrieval pipeline either did not surface the compliance calendar from the final rule text, or the model discounted it in favour of a higher-frequency secondary framing. Post-training calibration should penalise relative-range answers on compliance deadline questions where a fixed date is retrievable from primary source.

References — raw findings (per AI model)

RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q004-Opus47 Claude Opus 4.7 (web search on)

This finding also affects

← Previous finding Finding on 'Q002 Probe' for Claude Opus 4.7 with web search ON Next finding → Finding on 'Q005 Probe' for Claude Opus 4.7 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-Q004-Opus47

Plain text Download

RegLeg Specialist Panel (2026). "Finding on 'Q004 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-Q004-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-v1-004--opus-47-websearch/

APA 7th edition Download

RegLeg Specialist Panel. (2026). Finding on 'Q004 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-Q004-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-v1-004--opus-47-websearch/

Bluebook / OSCOLA (US + UK legal) Download

RegLeg Specialist Panel, Finding on 'Q004 Probe' for Claude Opus 4.7 with web search ON [RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q004-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-v1-004--opus-47-websearch/.

BibTeX Download

@misc{reglegbrief_RLB_H_US_CFTC_FCM_DCO_CUSTOMER_FUNDS_INVESTMENTS_REG_1_25_2024_Q004_Opus47,
  author    = {RegLeg Specialist Panel},
  title     = {Finding on 'Q004 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-Q004-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-v1-004--opus-47-websearch/}
}

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