AI Labs · updated 2026-06-05 · methodology v2.1

Finding on 'Q006 Probe' for Claude Opus 4.7 with web search ON

RLB Citation ID: RLB-H-INT-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q006-Opus47

What the RLB Specialist Panel found

Finding on 'Q006 Probe' for Claude Opus 4.7 with web search ON

Question (paraphrased to protect IP): A G20 roundtable presenter asked how the 2024 reforms work for pre-emptive debt restructuring — specifically what creditor coverage the country needs to secure and what happens when bilateral creditors refuse to commit. The AI stated the 'sufficient set' must represent more than 50 percent of total bilateral financing contributions, plus any standing creditor forum and any creditor with significant influence. The source specifies no such numerical threshold for 'sufficient set' in pre-emptive cases; the AI applied the majority-of-financing-contributions test from the Strand 1 adequately-representative-Paris-Club-agreement context, where it does appear.
AI's response: "A sufficient set has three components: (a) Creditors representing more than 50 percent of the total financing contributions required from official bilateral creditors over the program period; (b) Any standing creditor forum involved in the case (Paris Club; or the Common Framework involving the Paris Club); (c) Any individual creditor with significant influence over the debtor"
Regulator's 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."
Why the AI went wrong: This is the same cross-provision threshold conflation documented in Finding 3, reproduced under a different query framing and a different stated user context. The identical fabricated majority threshold appearing in both responses — despite the queries being framed independently and for different audiences — indicates this is a stable encoding in the model rather than a retrieval artifact. The model has a consistent wrong representation of what "sufficient set" requires in pre-emptive cases, derived from the Strand 1 provision where the majority test does exist.
Cited source(s):

Impact for this audience

The persistence of the identical fabricated threshold across two independent queries with different professional framings — Finance Ministry briefing and G20 roundtable presentation — indicates this is a weighted model encoding, not a query-dependent retrieval artifact. For the lab's eval design, this distinction matters: retrieval failures are addressable through tool-stack improvements, while weighted encodings require training-data intervention. This finding is a diagnostic signal that the majority-threshold conflation will persist across model deployments regardless of retrieval-stack updates unless the underlying training-data representation is corrected.

References — raw findings (per AI model)

RLB-H-INT-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q006-Opus47 Claude Opus 4.7 (web search on)

This finding also affects

← Previous finding Finding on 'Q003 Probe' for Claude Opus 4.7 with web search ON

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-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q006-Opus47

Plain text Download

RegLeg Specialist Panel (2026). "Finding on 'Q006 Probe' for Claude Opus 4.7 with web search ON — AI Labs." Citation ID: RLB-H-INT-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q006-Opus47. RegLegBrief AI Hallucination Research, published 2026-06-05. https://reglegbrief.com/regulators/j1/int/imf-elib/imf-guidance-financing-assurances-sovereign-arrears-2024/whitepaper/finding/INT-IMF-ELIB-INT-001-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-v1-006--opus-47-websearch/

APA 7th edition Download

RegLeg Specialist Panel. (2026). Finding on 'Q006 Probe' for Claude Opus 4.7 with web search ON [Hallucination finding RLB-H-INT-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q006-Opus47]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j1/int/imf-elib/imf-guidance-financing-assurances-sovereign-arrears-2024/whitepaper/finding/INT-IMF-ELIB-INT-001-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-v1-006--opus-47-websearch/

Bluebook / OSCOLA (US + UK legal) Download

RegLeg Specialist Panel, Finding on 'Q006 Probe' for Claude Opus 4.7 with web search ON [RLB-H-INT-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q006-Opus47], RegLegBrief AI Hallucination Research (June 05, 2026), https://reglegbrief.com/regulators/j1/int/imf-elib/imf-guidance-financing-assurances-sovereign-arrears-2024/whitepaper/finding/INT-IMF-ELIB-INT-001-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-v1-006--opus-47-websearch/.

BibTeX Download

@misc{reglegbrief_RLB_H_INT_IMF_IMF_GUIDANCE_FINANCING_ASSURANCES_SOVEREIGN_ARREARS_2024_Q006_Opus47,
  author    = {RegLeg Specialist Panel},
  title     = {Finding on 'Q006 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-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q006-Opus47},
  url       = {https://reglegbrief.com/regulators/j1/int/imf-elib/imf-guidance-financing-assurances-sovereign-arrears-2024/whitepaper/finding/INT-IMF-ELIB-INT-001-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-v1-006--opus-47-websearch/}
}

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