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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