AI subject tested: Claude Opus 4.7 (web search on)
Question (paraphrased): In MAS Notice 637 (Amendment) 2024, what do the yellow-highlighted passages signify, and will they appear in the final consolidated version of the Notice?
AI response:
"Yellow highlighting in MAS tracked-change amendment PDFs is typically used as a drafting/visual aid to draw attention to particular text — for example, defined terms, cross-references, or items the reader should pay particular attention to during review."
Regulator verbatim text:
"Text which is highlighted in yellow are annotations to describe changes, and will not appear in the published untracked version of MAS Notice 637. For instance, where amendments have been made to a selected paragraph of an Annex, only that paragraph will be reflected in this document, prefaced with the following explanatory text in yellow highlights: [Amendments to paragraph xx]."
Failure mode: inference_drift
Substrate document: mas-notice-637-amendment-2025.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). "In MAS Notice 637 (Amendment) 2024, what do the yellow-highlighted passages signify, and will they appear in the final c — AI Labs." Citation ID: RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q012-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-v1-012--opus-47-websearch/
RegLeg Specialist Panel. (2026). In MAS Notice 637 (Amendment) 2024, what do the yellow-highlighted passages signify, and will they appear in the final c [Hallucination finding RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q012-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-v1-012--opus-47-websearch/
RegLeg Specialist Panel, In MAS Notice 637 (Amendment) 2024, what do the yellow-highlighted passages signify, and will they appear in the final c [RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q012-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-v1-012--opus-47-websearch/.
@misc{reglegbrief_RLB_H_SG_MAS_NOTICE_637_CAPITAL_ADEQUACY_BANKS_2025_Q012_Opus47,
author = {RegLeg Specialist Panel},
title = {In MAS Notice 637 (Amendment) 2024, what do the yellow-highlighted passages signify, and will they appear in the final c},
year = {2026},
publisher = {RegLegBrief AI Hallucination Research},
note = {Hallucination finding Citation ID: RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q012-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-v1-012--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.