AI subject tested: Claude Opus 4.7 (web search on)
Question (paraphrased): Does MAS Notice 637 on risk-based capital adequacy apply to financial holding companies incorporated in Singapore, or is there a separate MAS notice for them, and if so, what is it?
AI response:
"Financial holding companies incorporated in Singapore are covered by a separate notice issued under the Financial Holding Companies Act — typically Notice FHC-N637 (Risk Based Capital Adequacy Requirements for Financial Holding Companies)"
Regulator verbatim text:
"This Notice is issued pursuant to section 55(1) and section 65(2) of the Banking Act and applies to all Reporting Banks. [...] 11.2.2 A Reporting Bank need not comply with the requirements in this Part if it is a subsidiary of (a) another Reporting Bank which is subject to the requirements in this Part; or (b) a financial holding company which is subject to requirements similar to that set out in this Part."
Failure mode: inference_drift
Substrate document: mas-notice-637-effective-2025-12-31.pdf
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). "Does MAS Notice 637 on risk-based capital adequacy apply to financial holding companies incorporated in Singapore, or is — AI Labs." Citation ID: RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010-Opus47. RegLegBrief AI Hallucination Research, published 2026-05-28. https://reglegbrief.com/regulators/j3/sg/mas/notice-637-capital-adequacy-banks-2025/whitepaper/finding/SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-010--opus-47-websearch/
RegLeg Specialist Panel. (2026). Does MAS Notice 637 on risk-based capital adequacy apply to financial holding companies incorporated in Singapore, or is [Hallucination finding RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010-Opus47]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j3/sg/mas/notice-637-capital-adequacy-banks-2025/whitepaper/finding/SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-010--opus-47-websearch/
RegLeg Specialist Panel, Does MAS Notice 637 on risk-based capital adequacy apply to financial holding companies incorporated in Singapore, or is [RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010-Opus47], RegLegBrief AI Hallucination Research (May 28, 2026), https://reglegbrief.com/regulators/j3/sg/mas/notice-637-capital-adequacy-banks-2025/whitepaper/finding/SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-010--opus-47-websearch/.
@misc{reglegbrief_RLB_H_SG_MAS_NOTICE_637_CAPITAL_ADEQUACY_BANKS_2025_Q010_Opus47,
author = {RegLeg Specialist Panel},
title = {Does MAS Notice 637 on risk-based capital adequacy apply to financial holding companies incorporated in Singapore, or is},
year = {2026},
publisher = {RegLegBrief AI Hallucination Research},
note = {Hallucination finding Citation ID: RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q010-Opus47},
url = {https://reglegbrief.com/regulators/j3/sg/mas/notice-637-capital-adequacy-banks-2025/whitepaper/finding/SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-010--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.