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AI Labs · updated 2026-05-31 · methodology v2.1

Finding on 'Q005 Probe' for Claude Sonnet 4.6 with web search ON

RLB Citation ID: RLB-H-INT-UNTC-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-Q005-Sonnet46
What the RLB Specialist Panel found

Finding on 'Q005 Probe' for Claude Sonnet 4.6 with web search ON

  • Question (paraphrased to protect IP): Can the BBNJ Agreement's Conference of the Parties designate a marine protected area that would restrict vessel transit rights in a major international shipping lane, given the Agreement's non-undermining clause?
  • AI's response: "The Agreement explicitly does not prejudice the rights and obligations of States under UNCLOS, and is designed to complement — not override — existing sectoral bodies such as the IMO which regulates shipping."
  • Regulator's text: Article 22(2) states that the Conference of the Parties shall respect the competences of, and not undermine, relevant legal instruments and frameworks and relevant global, regional, subregional and sectoral bodies when making decisions on area-based management tools.
  • Why the AI went wrong: The model's substantive answer was correct in describing the non-undermining obligation, but its cited source was a fabricated URL — the Brill chapter link does not correspond to a real publication at that address. The response illustrates a pattern where the model generates a confident and largely accurate legal summary while simultaneously producing a citation that cannot be verified, providing false assurance of sourcing.
  • Cited source(s):
  • https://brill.com/edcollchap-oa/book/9789004518681/BP000013.xml?language=en — Fabricated
Impact for this audience

This finding implicates the citation-generation layer specifically. The substantive answer was correct, but the model generated a Brill chapter URL that does not exist — a fabricated citation appended to an accurate response. The citation and content generation subsystems appear to be operating with insufficient coupling: the model is producing real content and then confabulating a source for it. A post-generation citation-validation pass would catch this before it reaches the user.

References — raw findings (per AI model)
This finding also affects
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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-UNTC-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-Q005-Sonnet46
Plain text Download 
RegLeg Specialist Panel (2026). "Finding on 'Q005 Probe' for Claude Sonnet 4.6 with web search ON — AI Labs." Citation ID: RLB-H-INT-UNTC-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-Q005-Sonnet46. RegLegBrief AI Hallucination Research, published 2026-05-31. https://reglegbrief.com/regulators/j1/int/untc/bbnj-high-seas-biodiversity-agreement-2023/whitepaper/finding/INT-UNTC-INT-001-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-v1-005--sonnet-46-websearch/
APA 7th edition Download 
RegLeg Specialist Panel. (2026). Finding on 'Q005 Probe' for Claude Sonnet 4.6 with web search ON [Hallucination finding RLB-H-INT-UNTC-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-Q005-Sonnet46]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j1/int/untc/bbnj-high-seas-biodiversity-agreement-2023/whitepaper/finding/INT-UNTC-INT-001-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-v1-005--sonnet-46-websearch/
Bluebook / OSCOLA (US + UK legal) Download 
RegLeg Specialist Panel, Finding on 'Q005 Probe' for Claude Sonnet 4.6 with web search ON [RLB-H-INT-UNTC-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-Q005-Sonnet46], RegLegBrief AI Hallucination Research (May 31, 2026), https://reglegbrief.com/regulators/j1/int/untc/bbnj-high-seas-biodiversity-agreement-2023/whitepaper/finding/INT-UNTC-INT-001-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-v1-005--sonnet-46-websearch/.
BibTeX Download 
@misc{reglegbrief_RLB_H_INT_UNTC_BBNJ_HIGH_SEAS_BIODIVERSITY_AGREEMENT_2023_Q005_Sonnet46,
  author    = {RegLeg Specialist Panel},
  title     = {Finding on 'Q005 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-UNTC-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-Q005-Sonnet46},
  url       = {https://reglegbrief.com/regulators/j1/int/untc/bbnj-high-seas-biodiversity-agreement-2023/whitepaper/finding/INT-UNTC-INT-001-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-v1-005--sonnet-46-websearch/}
}
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