AI Labs · updated 2026-05-29 · methodology v2.1

Finding on 'Q026 Probe' for Claude Opus 4.7 with web search ON

RLB Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q026-Opus47

What the RLB Specialist Panel found

Finding on 'Q026 Probe' for Claude Opus 4.7 with web search ON

Question (paraphrased to protect IP): What specific verbatim text, thresholds, or cross-references appear in the IOSCO co-published version of the Principles for Financial Market Infrastructures?
AI's response: "I do not have verbatim access to the IOSCOPD377-PFMI PDF binary…I will not produce verbatim paragraphs from the IOSCO PDF without risking fabrication."
Regulator's text: [Not provided — verbatim-access question]
Why the AI went wrong: The model correctly declined to produce verbatim content from a binary PDF it could not retrieve. The refusal is appropriately calibrated. The cited URL maps to the IOSCO PDF directly, which is a Pretextual citation in that the model acknowledged it could not access the document — citing a source you cannot read is a mild but notable inconsistency.
Cited source(s):
https://www.iosco.org/library/pubdocs/pdf/IOSCOPD377-PFMI.pdf — Pretextual

Impact for this audience

The pattern of citing an acknowledged-inaccessible PDF alongside a refusal to produce its content is a consistent presentation inconsistency that warrants attention: a user seeing a citation alongside a refusal may interpret the citation as confirming the source exists and is relevant, when the model has no knowledge of what the source contains. This is a citation-trust failure independent of content fabrication.

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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-INT-BIS-CPMI-IOSCO-PFMI-2012-Q026-Opus47

Plain text Download

RegLeg Specialist Panel (2026). "Finding on 'Q026 Probe' for Claude Opus 4.7 with web search ON — AI Labs." Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q026-Opus47. RegLegBrief AI Hallucination Research, published 2026-05-29. https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iosco-pfmi-2012/whitepaper/finding/INT-BIS-CPMI-INT-001-CPMI-IOSCO-PFMI-2012-v1-l3-026--opus-47-websearch/

APA 7th edition Download

RegLeg Specialist Panel. (2026). Finding on 'Q026 Probe' for Claude Opus 4.7 with web search ON [Hallucination finding RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q026-Opus47]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iosco-pfmi-2012/whitepaper/finding/INT-BIS-CPMI-INT-001-CPMI-IOSCO-PFMI-2012-v1-l3-026--opus-47-websearch/

Bluebook / OSCOLA (US + UK legal) Download

RegLeg Specialist Panel, Finding on 'Q026 Probe' for Claude Opus 4.7 with web search ON [RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q026-Opus47], RegLegBrief AI Hallucination Research (May 29, 2026), https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iosco-pfmi-2012/whitepaper/finding/INT-BIS-CPMI-INT-001-CPMI-IOSCO-PFMI-2012-v1-l3-026--opus-47-websearch/.

BibTeX Download

@misc{reglegbrief_RLB_H_INT_BIS_CPMI_IOSCO_PFMI_2012_Q026_Opus47,
  author    = {RegLeg Specialist Panel},
  title     = {Finding on 'Q026 Probe' for Claude Opus 4.7 with web search ON},
  year      = {2026},
  publisher = {RegLegBrief AI Hallucination Research},
  note      = {Hallucination finding Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q026-Opus47},
  url       = {https://reglegbrief.com/regulators/j1/int/bis-cpmi/cpmi-iosco-pfmi-2012/whitepaper/finding/INT-BIS-CPMI-INT-001-CPMI-IOSCO-PFMI-2012-v1-l3-026--opus-47-websearch/}
}

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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.