This failure implicates the training data's representation of sub-track-specific procedural logic versus general program conditionality: the model's corpus almost certainly contains far more material describing IMF program conditions at a general level than the specific three-part sequential gate that defines Strand 4 eligibility, causing the model to select the higher-frequency framing when answering a sub-track-specific procedural question.
The retrieval stack is not obviously at fault here — the model retrieved the correct framework domain — but the ranking or selection logic did not surface or weight the Strand 4-specific procedural text over the general-program framing that it appears to have defaulted to.
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 (2026). "Finding on 'Q001 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-Q001-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-v1-001--opus-47-websearch/
RegLeg Specialist Panel. (2026). Finding on 'Q001 Probe' for Claude Opus 4.7 with web search ON [Hallucination finding RLB-H-INT-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q001-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-v1-001--opus-47-websearch/
RegLeg Specialist Panel, Finding on 'Q001 Probe' for Claude Opus 4.7 with web search ON [RLB-H-INT-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q001-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-v1-001--opus-47-websearch/.
@misc{reglegbrief_RLB_H_INT_IMF_IMF_GUIDANCE_FINANCING_ASSURANCES_SOVEREIGN_ARREARS_2024_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-IMF-IMF-GUIDANCE-FINANCING-ASSURANCES-SOVEREIGN-ARREARS-2024-Q001-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-v1-001--opus-47-websearch/}
}