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

Claude Opus 4.7 with web search

RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q017-Sonnet46
What the RLB Specialist Panel found
  • 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 fabricated comment-period closing date (6 February 2026) is the most operationally consequential single error in this finding set: a compliance professional managing a consultation response who acts on this date would miss the actual deadline. This specific type of fabrication — a precise, actionable date presented with high confidence — should be explicitly targeted in safety and harm-assessment eval design for models deployed in legal and compliance contexts.

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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.

Plain text 
RegLeg Specialist Panel (2026). "Claude Opus 4.7 with web search — AI Labs." Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q017-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-v1-017--sonnet-46-websearch/
APA 7th edition 
RegLeg Specialist Panel. (2026). Claude Opus 4.7 with web search [Hallucination finding RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q017-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-v1-017--sonnet-46-websearch/
Bluebook / OSCOLA (US + UK legal) 
RegLeg Specialist Panel, Claude Opus 4.7 with web search [RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q017-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-v1-017--sonnet-46-websearch/.
BibTeX 
@misc{reglegbrief_RLB_H_INT_BIS_CPMI_IOSCO_PFMI_2012_Q017_Sonnet46,
  author    = {RegLeg Specialist Panel},
  title     = {Claude Opus 4.7 with web search},
  year      = {2026},
  publisher = {RegLegBrief AI Hallucination Research},
  note      = {Hallucination finding Citation ID: RLB-H-INT-BIS-CPMI-IOSCO-PFMI-2012-Q017-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-v1-017--sonnet-46-websearch/}
}
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