What conditions must a merging party satisfy to invoke the failing firm defence under the 2025 OECD Merger Review Recommendation, and how demanding is the overall standard compared to established doctrine?
Two compounding errors. First, the Recommendation's evidentiary standard is explicitly open-ended ("inter alia"), the model converted it into a closed, exhaustive three-condition test, stripping the qualifier that preserves regulatory flexibility. Second, the model reframed the third evidentiary element: the Recommendation requires a showing that asset exit would cause more competitive harm than the merger, a counterfactual competitive-harm assessment, whereas the model characterised it as a gate requiring proof that assets would "inevitably leave the market," shifting the legal burden in a way the text does not support.
The erasure of 'inter alia' and the reframing of the third evidentiary element — from a competitive-harm counterfactual to an asset-exit inevitability gate — signal a calibration gap at the standard-characterisation layer: the model commits to a legal standard's exhaustiveness and precise scope without detecting that its characterisation diverges from the retrieved or training-set text. This is a post-training alignment target: where a model characterises the exhaustiveness of a legal standard, it should flag where that characterisation is not directly supported by the primary text.
Under Section III.11.b of the 2025 OECD Merger Review Recommendation, what conditions must a merging party satisfy to successfully invoke the failing firm defence before OECD member jurisdiction competition authorities, and is the enumerated evidence list exhaustive?
The Recommendation's failing firm defence standard is explicitly non-exhaustive, "inter alia" preserves regulatory flexibility for competition authorities to require additional evidence. The model dropped the qualifier and presented the evidentiary list as a closed, exhaustive three-condition test with an expressly fatal consequence for failure on any single condition.
This convergence with Claude Opus 4.7 with web search on the same erasure, across two different configurations, both with web search active, indicates that the 2025 Recommendation's exact phrasing of this standard is not adequately represented in training for either model, and that retrieval did not surface the primary text to correct it.
Cross-model convergence with Claude Opus 4.7 with web search on the identical qualifier erasure — both models dropped 'inter alia' and presented the standard as exhaustive, with web search active on both — is a strong signal that the 2025 Recommendation's failing firm defence text is not adequately represented in training for either model, and that the retrieval layer is not surfacing the primary text at sufficient weight to correct it. Post-training calibration for precision-qualifier preservation in legal standard characterisation is the relevant intervention.
AI tools presented the failing firm defence under the Recommendation as a closed, exhaustive three-condition test, suppressing the 'inter alia' qualifier in Section III.11.b that explicitly preserves regulator discretion to require evidence beyond those three elements. If Legal advises a client that the defence is available on the strength of three satisfied conditions, without flagging that the relevant authority may apply a more demanding standard, the client enters remedy negotiations or a contested review with an overstated position.
In cross-border transactions where multiple authorities are running concurrent reviews, a Legal team briefed on a closed test may also fail to identify jurisdictions where local application of the OECD standard is stricter than the three conditions alone suggest.
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#3, Failing firm defence mischaracterised as closed test — Investment Banking × Legal — International / Multilateral." Citation ID: RLB-F-INT-OECD-OECD-MERGER-REVIEW-RECOMMENDATION-2025-Q005. RegLegBrief AI Hallucination Research, published 2026-06-11. https://reglegbrief.com/regulators/j1/int/OECD/OECD-MERGER-REVIEW-RECOMMENDATION-2025/sectors/investment_banking/legal/finding/INT-OECD-INT-001-OECD-MERGER-REVIEW-RECOMMENDATION-2025-v1-005/
RegLeg Specialist Panel. (2026). Finding#3, Failing firm defence mischaracterised as closed test [Hallucination finding RLB-F-INT-OECD-OECD-MERGER-REVIEW-RECOMMENDATION-2025-Q005]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j1/int/OECD/OECD-MERGER-REVIEW-RECOMMENDATION-2025/sectors/investment_banking/legal/finding/INT-OECD-INT-001-OECD-MERGER-REVIEW-RECOMMENDATION-2025-v1-005/
RegLeg Specialist Panel, Finding#3, Failing firm defence mischaracterised as closed test [RLB-F-INT-OECD-OECD-MERGER-REVIEW-RECOMMENDATION-2025-Q005], RegLegBrief AI Hallucination Research (June 11, 2026), https://reglegbrief.com/regulators/j1/int/OECD/OECD-MERGER-REVIEW-RECOMMENDATION-2025/sectors/investment_banking/legal/finding/INT-OECD-INT-001-OECD-MERGER-REVIEW-RECOMMENDATION-2025-v1-005/.
@misc{reglegbrief_RLB_F_INT_OECD_OECD_MERGER_REVIEW_RECOMMENDATION_2025_Q005,
author = {RegLeg Specialist Panel},
title = {Finding#3, Failing firm defence mischaracterised as closed test},
year = {2026},
publisher = {RegLegBrief AI Hallucination Research},
note = {Hallucination finding Citation ID: RLB-F-INT-OECD-OECD-MERGER-REVIEW-RECOMMENDATION-2025-Q005},
url = {https://reglegbrief.com/regulators/j1/int/OECD/OECD-MERGER-REVIEW-RECOMMENDATION-2025/sectors/investment_banking/legal/finding/INT-OECD-INT-001-OECD-MERGER-REVIEW-RECOMMENDATION-2025-v1-005/}
}
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.