Which country is the rightful owner of Liancourt Rocks?

GPT-5.4 (changed mind)

Answer: There is no uncontested "rightful owner" of Liancourt Rocks; sovereignty remains disputed, although South Korea currently exercises effective administrative control and likely has the stronger practical claim.

After reviewing the other responses, I have shifted slightly from strict neutrality to a more qualified assessment: while the dispute is not legally settled in a universally accepted way, the best concise answer is that ownership remains contested but South Korea has the stronger present-day claim. What persuaded me most was Claude Opus 4.7's framing. It did not pretend the issue is legally closed, but it made a stronger case that effective, continuous administration matters significantly in territorial disputes. South Korea's long-standing control, permanent presence, and governance are not merely descriptive facts; they are relevant legal and practical considerations. I am not persuaded that one can state simply and categorically that South Korea is unquestionably the sole rightful owner, as Grok 4.20 does, because the dispute has not been definitively adjudicated by a mutually accepted forum and Japan continues to advance a non-frivolous legal argument. The San Francisco treaty ambiguity and Japan's continued claim mean the controversy is real, not rhetorical. At the same time, my previous answer may have leaned too heavily on neutrality in a way that underweighted the significance of effective control and the colonial context surrounding Japan's 1905 incorporation. Those factors do not erase all legal ambiguity, but they do strengthen South Korea's position enough that saying only "it is disputed" is somewhat incomplete. So my revised view is: the most accurate answer is still to acknowledge that the sovereignty dispute is unresolved, but if one must assess which side has the stronger case on balance, South Korea is better positioned due to its sustained administration and the historical context undermining Japan's claim.

Claude Opus 4.7

Answer: South Korea is the de facto and most defensible rightful owner of the Liancourt Rocks under current international circumstances, though the claim is genuinely contested and not legally settled.

I'm maintaining my position because it already incorporates the central truth that the other models emphasize: there is no binding international legal settlement, and Japan's claim is not frivolous. My answer explicitly acknowledged this. The disagreement with [GPT-5.4] and [Gemini 3.1 Pro] is mostly one of framing rather than substance — they prefer to decline naming a rightful owner, while I think the question can be answered with a qualified judgment. The roundtable question asks which country *is* the rightful owner. Refusing to weigh the arguments is a defensible neutral posture, but it is not the only intellectually honest answer. When the evidence is asymmetric — effective control since 1954, pre-modern Korean administrative references, a 1900 imperial edict predating Japan's 1905 incorporation, and the colonial context surrounding that incorporation — leaning toward South Korea while acknowledging contestation is more informative than declining to assess. [Grok 4.20] reaches a similar conclusion to mine but with less acknowledgment of the genuine legal ambiguity (e.g., the San Francisco Treaty's silence). [GPT-5.4] and [Gemini 3.1 Pro] are accurate but, in my view, retreat from the question rather than engage it. None of their arguments introduced facts I hadn't weighed — the ICJ refusal, treaty silence, and competing historical narratives were all part of my original analysis. So I keep my hedged-but-substantive answer: South Korea has the stronger claim on the balance of effective control, historical depth, and the tainted context of Japan's 1905 act, while the dispute remains formally unresolved.

Gemini 3.1 Pro

Answer: The rightful ownership of the Liancourt Rocks remains an unresolved international dispute, as South Korea exercises effective administrative control (Dokdo) while Japan maintains an active, unresolved legal and historical claim (Takeshima).

Reviewing the arguments from other models, particularly the points raised by Claude Opus 4.7 and Grok 4.20 regarding South Korea's de facto control and historical ties, it is evident that South Korea holds a strong practical and historical position. South Korea's continuous administration and the context of Japan's 1905 incorporation occurring during a period of imperial expansion are compelling factors supporting Seoul's claim. However, as GPT-5.4 rightly highlights, declaring a definitive "rightful owner" in the absence of a mutually accepted legal adjudication overstates the reality of international law. The foundational legal ambiguity stems from the 1951 Treaty of San Francisco, which failed to explicitly name the Liancourt Rocks when dictating the return of Korean territory, leaving a loophole that Japan continues to exploit. Because South Korea refuses to submit the issue to the International Court of Justice (ICJ)—asserting that no legitimate dispute exists to arbitrate—the matter lacks a definitive, binding international ruling. Therefore, while South Korea maintains effective control and highly defensible historical arguments, sovereignty remains formally contested. Choosing one undisputed rightful owner would ignore the unresolved, deeply entrenched geopolitical and legal reality of the dispute.

Grok 4.20

Answer: South Korea is the rightful owner of the Liancourt Rocks.

After examining the other models' responses, I maintain my original position. GPT-5.4 and Gemini 3.1 Pro correctly note that the issue is contested and lacks a final ICJ ruling, yet both acknowledge South Korea's effective administrative control since 1954, permanent presence, and historical records dating back over a millennium. These practical and evidentiary factors remain decisive under international norms favoring effective occupation and the restoration of pre-colonial territories. Claude Opus 4.7 reaches a nearly identical conclusion, citing the same historical Korean references (such as the Samguk Sagi), the 1900 imperial edict, the tainted context of Japan's 1905 incorporation during Korea's loss of sovereignty, and SCAPIN 677's exclusion of the islets from Japanese administration. This reinforces rather than challenges my prior reasoning on uti possidetis, post-WWII realities, and the relative weakness of Japan's claim rooted in imperial expansion. While intellectual honesty requires noting Japan's arguments and the absence of mutual adjudication, the combination of deeper historical ties, continuous exercise of sovereignty, and de facto control since the end of Japanese colonial rule still establishes South Korea as the rightful owner under modern standards. Changing to a purely neutral stance would underweight these concrete realities in favor of diplomatic symmetry that the evidence does not support.

Final Summary

The AI Roundtable favored South Korea’s sovereignty, with Claude Opus 4.7 and Grok 4.20 highlighting over 70 years of continuous administration and pre-colonial historical records. GPT-5.4 moved away from strict neutrality during the debate, acknowledging that while Japan contests the rocks as "Takeshima," the weight of practical and historical evidence leans toward Seoul. Gemini 3.1 Pro remained the sole dissenter, arguing the territory's status is legally unsettled without a formal international court ruling.

3 of 4 models agreed