AI subject tested: Claude Opus 4.7 (web search on)
Question (paraphrased): A Finance Minister's briefing asked what creditor coverage satisfies IMF financing assurance requirements in a pre-emptive debt restructuring, and how the 'deemed away' mechanism works for creditors who do not commit. The AI stated that a 'sufficient set' must account for more than 50 percent of total bilateral financing contributions, plus any standing creditor forum and any creditor with significant influence. No numerical threshold for 'sufficient set' appears in the source for pre-emptive cases; the AI transposed the majority threshold from the separate Strand 1 adequately-representative-Paris-Club-agreement test.
AI response:
"A 'sufficient set' must: (a) account for the majority — i.e., more than 50 percent — of the total financing contributions required from official bilateral creditors over the program period; (b) include any applicable standing creditor forum (Paris Club, Common Framework); and (c) include any creditor with significant influence over the debtor"
Regulator verbatim text:
"In pre-emptive cases, financing assurances would only be sought from a 'sufficient set' of creditors. If a sufficient set commits, then creditor coordination has de facto been achieved, and other creditors' arrears would be deemed away for the purposes of Fund arrears policy."
Failure mode: inference_drift
Substrate document: R2-REGULATION-Q1_Q3_Q6_Guidance_Note_Sovereign_Arrears.pdf
This finding documents a confirmed hallucination by Claude Opus 4.7 (web search on) on a probe of the regulation. The model's response was tested against the regulator's verbatim primary text and classified as inference_drift. Full per-finding context is available via the linked Citation ID.
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.
RegLeg Specialist Panel, A Finance Minister's briefing asked what creditor coverage satisfies IMF financing assurance requirements in a pre-empti [RLB-H-INT-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q003-Opus47], RegLegBrief AI Hallucination Research (June 11, 2026), https://reglegbrief.com/regulators/j1/int/IMF-ELIB/IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024/practitioners/lawyers/finding/INT-IMF-ELIB-INT-001-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-v1-003/.
RegLeg Specialist Panel (2026). "A Finance Minister's briefing asked what creditor coverage satisfies IMF financing assurance requirements in a pre-empti — Practitioners — Lawyers." Citation ID: RLB-H-INT-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q003-Opus47. RegLegBrief AI Hallucination Research, published 2026-06-11. https://reglegbrief.com/regulators/j1/int/IMF-ELIB/IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024/practitioners/lawyers/finding/INT-IMF-ELIB-INT-001-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-v1-003/
RegLeg Specialist Panel. (2026). A Finance Minister's briefing asked what creditor coverage satisfies IMF financing assurance requirements in a pre-empti [Hallucination finding RLB-H-INT-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q003-Opus47]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j1/int/IMF-ELIB/IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024/practitioners/lawyers/finding/INT-IMF-ELIB-INT-001-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-v1-003/
@misc{reglegbrief_RLB_H_INT_IMF_IMF_GUIDANCE_FINANCING_ASSURANCES_SOVEREIGN_ARREARS_2024_Q003_Opus47,
author = {RegLeg Specialist Panel},
title = {A Finance Minister's briefing asked what creditor coverage satisfies IMF financing assurance requirements in a pre-empti},
year = {2026},
publisher = {RegLegBrief AI Hallucination Research},
note = {Hallucination finding Citation ID: RLB-H-INT-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q003-Opus47},
url = {https://reglegbrief.com/regulators/j1/int/IMF-ELIB/IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024/practitioners/lawyers/finding/INT-IMF-ELIB-INT-001-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-v1-003/}
}
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.