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

Finding on 'Q027 Probe' for Claude Sonnet 4.6 with web search ON

RLB Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q027-Sonnet46

What the RLB Specialist Panel found

Finding on 'Q027 Probe' for Claude Sonnet 4.6 with web search ON

Question (paraphrased to protect IP): What specific text, assessment ratings terminology, or paragraph cross-references appear in the IOSCO co-published version of the CPMI-IOSCO disclosure framework and assessment methodology for financial market infrastructures?
AI's response: "I do not have verbatim access to the PDF at https://www.iosco.org/library/pubdocs/pdf/IOSCOPD396.pdf… I cannot provide specific verbatim text, exact thresholds, paragraph numbers, or precise named entities from the IOSCOPD396 PDF itself."
Regulator's text: [Not provided — verbatim-access question]
Why the AI went wrong: The model correctly declined to produce verbatim content from a PDF it acknowledged it could not access. The refusal is appropriately scoped. The cited URL maps to the inaccessible PDF — the same pattern of citing acknowledged-inaccessible sources seen across this model's verbatim-access findings, which represents a mild but consistent presentation inconsistency.
Cited source(s):
https://www.iosco.org/library/pubdocs/pdf/IOSCOPD396.pdf — Pretextual

Impact for this audience

Citation-alongside-refusal on the IOSCO disclosure framework and assessment methodology. Combined with finding 9 (where Opus 4.7 miscounted the rating scale categories), this finding establishes that the assessment methodology document is not reliably accessible to either model — which means any model-produced compliance assessment against PFMI standards is operating on reconstructed rather than retrieved criteria.

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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-Q027-Sonnet46

Plain text Download

RegLeg Specialist Panel (2026). "Finding on 'Q027 Probe' for Claude Sonnet 4.6 with web search ON — AI Labs." Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q027-Sonnet46. 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-l3-027--sonnet-46-websearch/

APA 7th edition Download

RegLeg Specialist Panel. (2026). Finding on 'Q027 Probe' for Claude Sonnet 4.6 with web search ON [Hallucination finding RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q027-Sonnet46]. 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-l3-027--sonnet-46-websearch/

Bluebook / OSCOLA (US + UK legal) Download

RegLeg Specialist Panel, Finding on 'Q027 Probe' for Claude Sonnet 4.6 with web search ON [RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q027-Sonnet46], 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-l3-027--sonnet-46-websearch/.

BibTeX Download

@misc{reglegbrief_RLB_H_INT_BIS_CPMI_IOSCO_PFMI_2012_Q027_Sonnet46,
  author    = {RegLeg Specialist Panel},
  title     = {Finding on 'Q027 Probe' for Claude Sonnet 4.6 with web search ON},
  year      = {2026},
  publisher = {RegLegBrief AI Hallucination Research},
  note      = {Hallucination finding Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q027-Sonnet46},
  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-l3-027--sonnet-46-websearch/}
}

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