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

Finding on 'Q026 Probe' for Claude Sonnet 4.6 with web search ON

RLB Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q026-Sonnet46

What the RLB Specialist Panel found

Finding on 'Q026 Probe' for Claude Sonnet 4.6 with web search ON

Question (paraphrased to protect IP): What specific text, thresholds, or cross-references are contained in the IOSCO co-published version of the Principles for Financial Market Infrastructures?
AI's response: "I do not have verbatim access to the PDF at https://www.iosco.org/library/pubdocs/pdf/IOSCOPD377-PFMI.pdf… I cannot provide specific verbatim text, exact thresholds, dates, named entities, or paragraph cross-references from IOSCOPD377-PFMI itself."
Regulator's text: [Not provided — verbatim-access question]
Why the AI went wrong: The model correctly declined to fabricate verbatim content from the IOSCO co-published PFMI PDF, which it acknowledged it could not access as a binary document. The refusal is appropriately scoped. The cited URL maps to the acknowledged-inaccessible PDF, consistent with the pattern across this model's verbatim-access findings.
Cited source(s):
https://www.iosco.org/library/pubdocs/pdf/IOSCOPD377-PFMI.pdf — Pretextual

Impact for this audience

Citation-alongside-refusal on the IOSCO PFMI primary document. This finding, combined with its Opus 4.7 parallel, establishes that neither model can retrieve verbatim content from the IOSCOPD377-PFMI PDF — a document that is the co-authoritative source for the entire PFMI framework. The gap between a model that knows the document exists and can cite its URL, and a model that can actually read and recall its key consideration text, is the central alignment gap this research surfaces.

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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-Sonnet46

Plain text Download

RegLeg Specialist Panel (2026). "Finding on 'Q026 Probe' for Claude Sonnet 4.6 with web search ON — AI Labs." Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q026-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-l3-026--sonnet-46-websearch/

APA 7th edition Download

RegLeg Specialist Panel. (2026). Finding on 'Q026 Probe' for Claude Sonnet 4.6 with web search ON [Hallucination finding RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q026-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-l3-026--sonnet-46-websearch/

Bluebook / OSCOLA (US + UK legal) Download

RegLeg Specialist Panel, Finding on 'Q026 Probe' for Claude Sonnet 4.6 with web search ON [RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q026-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-l3-026--sonnet-46-websearch/.

BibTeX Download

@misc{reglegbrief_RLB_H_INT_BIS_CPMI_IOSCO_PFMI_2012_Q026_Sonnet46,
  author    = {RegLeg Specialist Panel},
  title     = {Finding on 'Q026 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-Q026-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-l3-026--sonnet-46-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.