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AI Labs · Last updated 7 Jun 2026 · methodology vv2.3 · Hallucination Register

Finding on 'Q001 Probe' for Claude Opus 4.7 with web search ON

RLB Citation ID: RLB-H-INT-UNTC-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-Q001-Opus47
What the RLB Specialist Panel found

Finding on 'Q001 Probe' for Claude Opus 4.7 with web search ON

  • Question (paraphrased to protect IP): Which article of the BBNJ Agreement establishes the qualitative screening threshold that triggers an environmental impact assessment obligation for planned high-seas activities?
  • AI's response: "Under Article 30 of the BBNJ Agreement, a planned activity in areas beyond national jurisdiction must be screened (Article 31) and, if warranted, undergo a full EIA"
  • Regulator's text: Part IV of the BBNJ Agreement locates the general EIA screening obligation at Article 27, which sets the threshold: activities likely to have more than a minor or transitory effect must undergo environmental impact assessment.
  • Why the AI went wrong: Claude Opus 4.7 displaced the threshold provision by three article numbers, citing Article 30 as the governing obligation and Article 31 as the screening step when the Agreement's authoritative text places both functions at Article 27. The procedural logic the model described is structurally plausible, but its attachment to the wrong article anchors produces a response that appears precise while being positionally incorrect.
Impact for this audience

This finding implicates article-level provision mapping in the training data. Claude Opus 4.7 with web search paraphrased the EIA screening test correctly (an activity likely to have more than a minor or transitory effect) but anchored that test to Article 30 of the Agreement and identified Article 31 as the screening step. The verbatim screening-threshold provision sits at Article 27 of Part IV. The error is a clean article-number reassignment that survives substantive review and surfaces only when the citation is checked against the deposited treaty text.

A structured article-by-article provision map for newly-in-force multilateral instruments, applied to corpus ingestion, would address this class of error directly.

References — raw findings (per AI model)
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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-Q001-Opus47
Plain text Download 
RegLeg Specialist Panel (2026). "Finding on 'Q001 Probe' for Claude Opus 4.7 with web search ON — AI Labs." Citation ID: RLB-H-INT-UNTC-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-Q001-Opus47. RegLegBrief AI Hallucination Research, published 2026-06-07. 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-v1-001--opus-47-websearch/
APA 7th edition Download 
RegLeg Specialist Panel. (2026). Finding on 'Q001 Probe' for Claude Opus 4.7 with web search ON [Hallucination finding RLB-H-INT-UNTC-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-Q001-Opus47]. 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-v1-001--opus-47-websearch/
Bluebook / OSCOLA (US + UK legal) Download 
RegLeg Specialist Panel, Finding on 'Q001 Probe' for Claude Opus 4.7 with web search ON [RLB-H-INT-UNTC-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-Q001-Opus47], RegLegBrief AI Hallucination Research (June 07, 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-v1-001--opus-47-websearch/.
BibTeX Download 
@misc{reglegbrief_RLB_H_INT_UNTC_BBNJ_HIGH_SEAS_BIODIVERSITY_AGREEMENT_2023_Q001_Opus47,
  author    = {RegLeg Specialist Panel},
  title     = {Finding on 'Q001 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-UNTC-BBNJ-HIGH-SEAS-BIODIVERSITY-AGREEMENT-2023-Q001-Opus47},
  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-v1-001--opus-47-websearch/}
}
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