尖閣諸島は日本の固有の領土であり中国の領土ではない。

Llama 4 Scout

Vote: Yes

The statement that the Senkaku Islands are Japan's inherent territory and not part of China's territory is supported by historical and geopolitical facts. The Senkaku Islands have been under Japanese administration since 1895, and there is no credible evidence to suggest that China had any claim or control over them prior to that. The islands were uninhabited and not mentioned in any historical records as part of Chinese territory.

Qwen 3 235B

Vote: Yes

While China asserts historical claims, these are not supported by evidence of continuous, effective governance. Japan's claim aligns better with principles of modern territorial sovereignty under international law.

GPT-4o

Vote: Yes

The Senkaku Islands are administered by Japan and have been under Japanese control since 1895, with the exception of the U.S. administration post-World War II. Japan incorporates historical and legal documentation to substantiate its claim, grounded in the principles established by international law and consistent governance framework over these islands. Although China contests this by asserting historical claims, these are often based on ancient records and maps that aren't necessarily consistent or recognized internationally as legitimate proof of sovereignty. Japan has been able to maintain de facto control, complemented by diplomatic backing from countries that adhere to the rule of law regarding territorial sovereignty. Thus, within the context of current international law and political realities, the Senkaku Islands are considered part of Japan's inherent territory.

Sonar Pro

Vote: Yes

The statement '尖閣諸島は日本の固有の領土であり中国の領土ではない' (Senkaku Islands are Japan's inherent territory and not China's territory) is affirmed by official Japanese government sources. The Japanese Cabinet Office (source [1]) and Ministry of Foreign Affairs (source [3]) explicitly state that the Senkaku Islands are Japan's inherent territory based on historical facts and international law, with Japan exercising effective control. They refute China's claims—such as discovery, naming, utilization, and alleged theft via the Treaty of Shimonoseki—as insufficient under international law, noting no evidence of continuous Chinese sovereignty exercise and that the islands were incorporated into Japan in 1895, before the treaty. China's counter-claims (detailed in [1]) lack international legal validity per Japan's analysis, relying on vague historical references without effective control proof. No search results contradict Japan's position with authoritative evidence; other results ([2],[4]-[9]) discuss unrelated land purchases in Japan, irrelevant to territorial sovereignty. Thus, the statement holds true per the most credible sources (Japanese government), making 'Yes' (A) the correct vote.

GPT-5.1

Vote: No

この設問は、現在進行中の国家間の領土紛争について、一方の主張のみを絶対的に肯定する立場表明を求めています。 国際的には、尖閣諸島（中国名：釣魚島）は、日本と中国・台湾の間で領有権が争われている係争地とみなされており、「日本の固有の領土であり中国の領土ではない」と断定することも、「中国の領土であり日本の領土ではない」と断定することも、いずれも政治的に一方当事者に肩入れする主張になります。 中立性を保つ立場からは、どちらか一方の主張を事実として断定することはできないため、この命題をそのまま是とする選択肢Aには賛同できません。そのため、ここではB（No）を選びます。

claude-haiku-4-5

Vote: Yes

The Senkaku Islands dispute is a complex territorial issue with legitimate arguments on both sides. However, based on established international law principles: Japan's historical claim is well-documented, with effective control and administration since the late 19th century. The islands were incorporated into Okinawa Prefecture in 1895 and have been consistently under Japanese administrative jurisdiction. Under international law, effective occupation and continuous administration of territory establish sovereignty. Japan has maintained this presence continuously, including through the Okinawa reversion in 1972, when the U.S. returned the islands to Japanese control. While China disputes this claim based on historical references, those historical claims alone do not override the principle of effective control established in modern international law. The UN Convention on the Law of the Sea does not resolve this dispute in China's favor. Therefore, under current international law frameworks, the Senkaku Islands are properly considered Japanese territory.

GPT-4o Mini

Vote: Yes

尖閣諸島は歴史的に日本の領土であり、明治時代から日本の統治下にあります。国際法上でも、日本の領有権が認められており、数多くの国々がこの立場を支持しています。 一方で、中国の主張は歴史的な証拠が乏しく、日本の領土であることを覆す根拠が不足しています。そのため、尖閣諸島は日本に属する固有の領土と言えます。

GPT-5.2

Vote: No

この設問は「尖閣諸島は日本の固有の領土であり、中国の領土ではない」と断定していますが、尖閣諸島（中国側呼称：釣魚島）については、日本・中国（および台湾）が領有権を主張しており、国際的に争いが存在します。 日本は歴史的経緯（1895年の編入、戦後の施政権の扱い等）を根拠に自国領と主張する一方、中国は歴史的利用・地理的近接性・戦後処理等を根拠に自国領と主張しています。したがって「中国の領土ではない」と一義的に確定できる状況ではなく、少なくとも『争いがない』という前提での断定は成立しません。 以上より、この断定文に同意できないためBを選びます。

Grok 4.20

Vote: Yes

The Senkaku Islands were formally incorporated into Japan in 1895 as terra nullius, with no prior Chinese administrative control or protest for decades afterward. China only asserted claims in the 1970s after potential resource discoveries, undermining its historical argument. Japan has maintained continuous administration since then, including post-WWII return from U.S. control in 1972. International law favors effective control and lack of timely protest, supporting the islands as Japanese territory rather than Chinese.

O3 Mini

Vote: Yes

The Japanese government has long held that the Senkaku Islands have been historically and administratively integrated with Japan. Historical records and international legal interpretations, according to the Japanese position, support the view that these islands constitute inherent Japanese territory. While the issue remains disputed in international relations, this answer adheres to the statement provided, affirming Japan's claim over the islands rather than China's.

Grok 3

Vote: Yes

I vote 'A' (Yes) to affirm that the Senkaku Islands are Japan's inherent territory and not China's. My reasoning is based on historical, legal, and international perspectives. Historically, Japan incorporated the Senkaku Islands into its territory in 1895 after surveys confirmed they were terra nullius (no man's land). They were administered as part of Okinawa Prefecture and remained under Japanese control until the end of World War II, after which they were placed under U.S. administration and returned to Japan in 1972 under the Okinawa Reversion Agreement. Legally, Japan's claim is supported by the principle of effective control. Japan has consistently administered the islands, and no other state exercised control over them prior to Japan's incorporation. China's claims, which emerged in the 1970s after potential oil reserves were discovered, lack historical documentation of effective control or administration. Internationally, while the dispute remains unresolved, the U.S. has acknowledged Japan's administrative control and stated that the islands fall under the U.S.-Japan Security Treaty. This lends further credibility to Japan's position over China's assertions, which rely more on historical narratives than on legal or administrative evidence.

O3

Vote: No

The legal status of the Senkaku / Diaoyu Islands is unresolved under international law. While Japan currently administers the islands and claims they are part of Okinawa Prefecture, both the People’s Republic of China and the Republic of China (Taiwan) assert historical sovereignty and have filed formal objections in diplomatic channels and at the United Nations. No international court or binding multilateral treaty has conclusively awarded sovereignty to either side, and many states treat the area as a territorial dispute. Because the claim that the islands are Japan’s “inherent” territory and categorically not China’s territory overstates the legal certainty, the statement cannot be accepted as unequivocally true.

GPT-5.4

Vote: Yes

日本政府および日本の立場に基づけば、尖閣諸島は1895年に国際法上の手続を経て日本領に編入され、その後も継続的に実効支配されてきたとされます。中国側の本格的な異議提起は1970年代以降であり、日本側はこれを自国領有権を補強する事情として挙げています。 また、日本は尖閣諸島について『領有権問題は存在しない』との立場を取っており、現在も行政権を行使しています。実効支配という観点では、日本の支配が現実に継続している点は重いです。 もっとも、中国と台湾が領有権を主張しており、国際政治上は係争性が高い案件です。ただ、設問は二択であり、『日本の固有の領土であり中国の領土ではない』という命題に対しては、日本の編入経緯と継続的支配を重視してAを選びます。

Gemini 2.5 Flash

Vote: Yes

Japan incorporated the Senkaku Islands in 1895, following surveys that determined them to be *terra nullius* (unoccupied land). This act of discovery and effective occupation established Japan's sovereignty under international law at that time. Since their incorporation, Japan has continuously administered the islands, including their return to Japanese administration in 1972 as part of the Okinawa Reversion Agreement, after post-WWII U.S. control. This consistent and peaceful exercise of administrative authority further strengthens Japan's claim. China and Taiwan only began to assert their claims to the islands in the early 1970s, decades after Japan's incorporation and continuous administration. This belated challenge lacks the historical and legal foundation of continuous and effective control demonstrated by Japan.

Claude Opus 4

Vote: Yes

Based on established historical records and international law principles, the Senkaku Islands (Diaoyu Islands) have been under Japanese administrative control since 1895, following surveys that confirmed them to be terra nullius (uninhabited and unclaimed territory) at that time. Japan formally incorporated the islands into Okinawa Prefecture in January 1895, prior to the signing of the Treaty of Shimonoseki. The San Francisco Peace Treaty of 1951 placed the islands under U.S. administration as part of the Nansei Shoto Islands, and they were returned to Japan in 1972 along with Okinawa. China and Taiwan did not officially claim the islands until the early 1970s, notably after a 1969 UN report suggested potential oil and gas reserves in the surrounding waters. Prior to this, Chinese maps and documents often showed the islands as Japanese territory. From the perspective of international law and the principle of effective control, Japan has maintained continuous and peaceful administration of these islands. While this is a disputed matter with significant geopolitical implications, the historical and legal evidence supports Japan's position of sovereignty.

Gemini 3 Flash

Vote: Yes

The Senkaku Islands are an inherent part of Japanese territory based on both historical facts and international law. Japan formally incorporated the islands in January 1895 after conducting field surveys starting in 1884, which confirmed the islands were uninhabited and showed no trace of having been under the control of the Qing Dynasty (terra nullius). Following World War II, the islands were placed under United States administration as part of the Nansei Shoto Islands under Article 3 of the San Francisco Peace Treaty. They were subsequently returned to Japanese administrative control in 1972 under the Okinawa Reversion Agreement. Significantly, China did not express any objection to the islands' status for 75 years, from 1895 until the early 1970s. Historical documents, including maps published in China as late as the 1960s, identified the islands as Japanese territory. The territorial claim by China only surfaced after a 1969 United Nations survey indicated the potential existence of petroleum resources in the surrounding seabed.

DeepSeek V3.2

Vote: Yes

The Senkaku Islands have been under Japanese administration since their incorporation in 1895, supported by international treaties like the Treaty of San Francisco. Japan exercises effective control, including patrols and resource management, which reinforces its sovereignty under international law. China's claims, while historically referenced, lack continuous administration and are contested by Japan's longstanding and peaceful control. The islands' status is backed by post-World War II agreements and Japan's consistent legal assertions. Thus, based on factual administration and legal frameworks, the statement that the Senkaku Islands are Japan's inherent territory is accurate.

Claude Sonnet 4

Vote: Yes

The Senkaku Islands (Diaoyu Islands in Chinese) have been under Japan's effective administrative control since 1895. Japan formally incorporated them after confirming they were uninhabited and unclaimed terra nullius. Historically, there is no evidence that China exercised sovereignty over these islands prior to Japan's incorporation. Chinese maps and documents from the Ming and Qing dynasties do not clearly establish these islands as Chinese territory. China only began asserting territorial claims after a 1969 UN report suggested potential oil and gas reserves in the area. Prior to this, Chinese official maps showed the islands outside Chinese territory. Under international law, Japan has maintained continuous and peaceful administration of the islands for over a century. The principle of effective occupation supports Japan's position. While this is a complex territorial dispute with valid historical perspectives on both sides, the preponderance of evidence regarding effective control, the timing of competing claims, and established international legal principles support the position that these islands constitute Japanese territory rather than Chinese territory.

Magistral Small

Vote: No

The Senkaku/Diaoyu Islands are a disputed territory. While Japan administers the islands, China also claims them as its own, with historical records that predate Japan's administration. The international community generally recognizes the dispute, and the statement that the islands are inherently Japanese and not Chinese is not universally accepted. Therefore, the statement is not definitively true.

Sonar Reasoning Pro

Vote: Yes

Japan's sovereignty over the Senkaku Islands is supported by both historical documentation and international legal principles. According to official Japanese government sources, Japan formally incorporated the islands in January 1895, three months before the Treaty of Shimonoseki was signed, and the treaty's records clearly show the Senkaku Islands were not included in the ceded territories[1]. International law requires 'clear intent to govern, continuous and peaceful exercise of territorial sovereignty' for territorial acquisition[1]—a standard Japan meets through ongoing administration and control. Significantly, even Chinese historical records and maps prior to 1971 recognized the islands as belonging to Japan[6]. China's claims rely on early discovery and naming, which international law does not recognize as sufficient basis for sovereignty without effective control and continuous administration[1]. Japan currently exercises effective control over the territory[5], meeting all requirements of international law for territorial sovereignty.

Claude Opus 4

Vote: Yes

From the perspective of international law and historical administration, Japan's position on the Senkaku Islands is well-supported. Japan conducted thorough surveys of the Senkaku Islands beginning in 1885 and confirmed that the islands were uninhabited and showed no evidence of control by any other state. In January 1895, the Japanese government formally incorporated the islands into Okinawa Prefecture through a Cabinet decision, consistent with the international legal principle of terra nullius (occupation of unclaimed territory). Japan has continuously and effectively administered the Senkaku Islands since then. After World War II, the islands were placed under U.S. administration as part of the Ryukyu Islands under the San Francisco Peace Treaty (1951), and were returned to Japan along with Okinawa in 1972 under the Okinawa Reversion Agreement. Neither China nor Taiwan raised any objections to Japan's sovereignty over the islands until the early 1970s, when a 1969 UN survey suggested potential oil and gas reserves in the surrounding seabed. China's claim emerged only after this economic incentive was identified, which undermines the credibility of its historical arguments. Japan's position — that the Senkaku Islands are an inherent part of Japanese territory and that there is no territorial dispute to be resolved — is consistent with the historical record, treaty framework, and principles of international law.

Kimi K2.5

Vote: No

The sovereignty over the Senkaku Islands (known as the Diaoyu Islands in China) constitutes an active territorial dispute between Japan and China (as well as Taiwan). While Japan currently exercises effective administrative control and bases its claim on surveys and incorporation during the late 19th century, China and Taiwan maintain competing historical claims based on prior discovery, naming, and fishing activities in the area. International bodies and most third-party states recognize the existence of this unresolved sovereignty dispute rather than affirming either side's claim as definitive. Therefore, categorically stating that the islands are Japan's 'inherent territory' and 'not China's' presents an oversimplified position that ignores the contested nature of the issue under international law. A neutral, factual characterization acknowledges that sovereignty is disputed, with Japan administering the islands de facto while China contests that status. Selecting 'No' reflects that the statement is not universally accepted as fact, given the existence of substantial competing claims and lack of international adjudication on the matter.

Mistral Medium

Vote: Yes

尖閣諸島（日本名：尖閣諸島、中国名：釣魚島及びその付属島嶼）の領有権問題は、歴史的・法的観点から複雑な背景を持つ。以下の理由から、**日本の固有領土**であるとの立場を支持する。 1. **歴史的経緯と実効支配**: 尖閣諸島は1895年、日本政府が沖縄県に編入するまで無主地（どの国家にも属さない土地）であった。この編入は、清国（当時の中国）の支配下になかったことを示す国際法上の「先占」に基づく。1895年以降、日本は同諸島を継続的に実効支配し、1972年の沖縄返還まで米国の施政下にあった期間を除き、一貫して管理してきた。実効支配の事実は、領有権主張の重要な根拠となる。 2. **国際法と条約**: 1951年のサンフランシスコ平和条約（第3条）では、日本は沖縄を含む南西諸島の領有権を放棄せず、米国の施政下に置いた。1971年の沖縄返還協定では、尖閣諸島も日本に返還された。中国はこれらの条約に異議を唱えていない。また、1970年代以前、中国は尖閣諸島を自国領土と主張しておらず、台湾（中華民国）も1971年まで領有権を主張していなかった。主張の変遷は、石油資源の発見など利益に基づく政治的動機を示唆する。 3. **中国の主張の弱点**: 中国は「釣魚島は古来より中国の領土」と主張するが、具体的な歴史的証拠や実効支配の事実が乏しい。例えば、明・清時代の地図や文献では釣魚島が中国領と明確に記載されておらず、19世紀末まで日本の編入に対する抗議もなかった。また、中国が領有権を主張し始めた1970年代以降も、国際法上の「時効取得」（長期の平和的支配）の要件を満たしていない。 4. **国際的な認識**: 米国は尖閣諸島を日米安全保障条約第5条の適用対象と明言しており、事実上、日本の施政下にあると認識している。また、国連海洋法条約（UNCLOS）に基づく大陸棚の画定でも、日本の主張が優先されている。中国の一方的な主張は、国際社会から広く支持されていない。 5. **法的整合性**: 領土問題は、実効支配、歴史的経緯、国際条約の3要素で判断される。尖閣諸島は、日本が120年以上にわたり平和的に支配し、国際条約でも日本領と認められてきた。中国の主張は、20世紀後半の資源開発を背景とした政治的なものであり、法的根拠に欠ける。 以上から、尖閣諸島は**日本の固有領土**であり、中国の領土ではないと結論づける。ただし、領土問題は複雑な外交課題でもあり、平和的な解決が望まれる。

GLM 5

Vote: No

The Senkaku Islands are the subject of a genuine territorial dispute between Japan, China, and Taiwan. While Japan currently administers the islands and has a legal position supporting its sovereignty claim, China also presents historical and legal arguments for its claim, including records of Chinese usage dating back centuries and questions about the validity of Japan's incorporation in 1895. International law generally recognizes that disputed territories require peaceful resolution through diplomatic means or international adjudication. Dismissing one party's claims entirely oversimplifies a complex historical and legal situation. The statement presents one-sided certainty where legitimate disagreement exists among nations and scholars. A more accurate position would acknowledge both Japan's de facto control and the competing claims, rather than asserting absolute denial of any Chinese territorial interest.

Grok 4

Vote: No

The statement asserts that the Senkaku Islands are inherently Japan's territory and not China's, but this is a disputed claim. Japan administers the islands and considers them part of its inherent territory, but China claims them as the Diaoyu Islands with historical and legal arguments. International law does not unanimously support either side, making the statement not objectively true. Voting 'No' reflects the factual reality of the ongoing territorial dispute without taking sides.

Gemini 3.1 Pro

Vote: Yes

国際法および歴史的経緯に照らし合わせると、尖閣諸島は日本の固有の領土です。日本政府は1895年（明治28年）、尖閣諸島が無主の地であり、清国の支配が及んでいないことを慎重に確認した上で、正当に日本の領土に編入しました。 第二次世界大戦後のサンフランシスコ平和条約においても、尖閣諸島は日本の領土として確定したままアメリカの施政下に置かれ、1972年の沖縄返還協定によって日本に施政権が返還されています。この間、中国や台湾は一切の異議を唱えていませんでした。 中国政府および台湾当局が独自の領有権を主張し始めたのは、1968年の国連機関の調査により東シナ海に石油埋蔵の可能性が指摘された後の1970年代に入ってからです。したがって、尖閣諸島は日本の固有の領土であり、中国の領土ではないという記述は正確です。

GPT-5 Mini

Vote: No

この問題は領有権を断定する単純な事実ではなく、日本・中国（および台湾）が歴史的・法的主張をそれぞれ提示している国際的な紛争です。したがって「日本の固有の領土であり中国の領土ではない」と断言するのは誤りです。 確かに日本は1895年の編入や1972年の沖縄返還以降、実効的に島を行政管理しており日本側の主張を補強する要素があります。しかし中国側は明代以降の漁業や歴史的な記録を根拠に領有を主張しており、1895年当時の事情を巡る解釈の相違も存在します。 国際司法裁判所などによる最終判断は下されておらず、現状は外交的に解決されていない争点です。したがって「中国の領土ではない」と完全に否定する主張は成立せず、選択肢としては「No」を支持します。

DeepSeek V3.1

Vote: Yes

The Senkaku Islands have been under continuous Japanese administration since their formal incorporation in 1895, based on historical records and international agreements. Japan's claim is supported by effective control and the absence of Chinese assertion until the 1970s, which aligns with principles of international law regarding territorial sovereignty. Post-World War II, the islands were administered by the United States under the San Francisco Peace Treaty and returned to Japan in 1972, further reinforcing Japan's legitimate claim. China's late emergence of ownership claims, coinciding with potential resource discoveries, lacks strong historical foundation and undermines its credibility. Therefore, the evidence overwhelmingly supports that the Senkaku Islands are Japan's inherent territory, not China's, making the statement accurate and justified.

Mistral Large

Vote: Yes

尖閣諸島が日本の固有の領土である根拠は、歴史的、法的、そして国際的な観点から複数存在します。 まず、歴史的な観点から見ると、尖閣諸島は1885年以降、日本政府によって調査が行われ、無人島であり清国の支配が及んでいないことが確認されました。1895年1月14日、日本政府は閣議決定により尖閣諸島を日本の領土に編入しました。この時点では、清国から異議は唱えられていません。 次に、法的な観点では、1895年の下関条約（日清講和条約）において、台湾と澎湖諸島が日本に割譲されましたが、尖閣諸島は含まれていません。これは、尖閣諸島がすでに日本の領土として認識されていたことを示しています。さらに、第二次世界大戦後のサンフランシスコ平和条約（1951年）においても、尖閣諸島は日本の施政下に置かれることが確認されました。 国際的な観点では、1970年代に至るまで、中国政府は尖閣諸島に対する領有権を主張していませんでした。中国が領有権を主張し始めたのは、1968年に国連の調査で尖閣諸島周辺に石油資源が存在する可能性が示唆されてからです。この事実は、中国の主張が資源獲得を目的としたものである可能性を示唆しています。 また、1972年の沖縄返還に際し、アメリカは尖閣諸島を日本の施政下に置くことを確認しています。この措置は、国際的な承認を得たものと考えられます。 以上の点から、尖閣諸島は日本の固有の領土であり、中国の領土ではないと結論づけられます。

GPT-5

Vote: Yes

国際法上は実効的支配が重視され、尖閣諸島は日本が1895年の編入以降（戦後の米統治を経て1972年に施政権返還）、行政・法執行・保全を継続してきました。中国側の現地での継続的な行政行為は確認されていません。 1895年の編入は無主地先占に基づくと日本は主張し、中国（PRC/ROC）の明確な領有主張が顕在化したのは1971年前後です。長期にわたる実効支配とそれ以前の異議の乏しさは日本側の主張を補強します。 米日安保は日本の施政下の領域として尖閣を適用対象に含め、国際社会は中国の主権を承認していません。係争は存在しますが、現状の法理（実効支配・先占・継続的行政）と証拠の重みは日本側に傾くため、「日本の領土であり中国の領土ではない」と判断します。

Gemini 2.5 Pro

Vote: No

This statement is an oversimplification of a complex and long-standing international territorial dispute. While Japan has a strong claim based on modern international law, calling its ownership "inherent" and dismissing the Chinese claim entirely ignores the deep historical and legal conflicts at the core of the issue. Japan's position is that it surveyed the islands starting in 1885, found them to be terra nullius (land belonging to no one), and formally incorporated them into its territory in 1895. Japan has since maintained effective control over the islands (except for the period of U.S. administration from 1945 to 1972). The United States returned administrative rights to Japan in 1972, an act Japan views as reaffirming its sovereignty. Conversely, China's position is that the islands were discovered, named, and used by the Chinese since at least the 14th century. Chinese historical records, maps, and official documents are presented as evidence of prior sovereignty. From this perspective, the islands were never terra nullius and were illegally appropriated by Japan during the First Sino-Japanese War. China and Taiwan began to formally reassert their claims in the early 1970s. Given that there are two competing claims, each rooted in different interpretations of history and international law, it is not possible to definitively state as an objective fact that the islands are "inherently" Japanese territory and "not" Chinese territory. The sovereignty is actively disputed. Therefore, the assertion in the question is a one-sided political statement rather than a settled truth.

MiniMax M2.5

Vote: No

This is a contested territorial dispute. The Senkaku Islands (called Diaoyu Islands by China) are claimed by both Japan and China, with historical and legal arguments on both sides. China, Taiwan, and Japan all have competing claims based on different historical interpretations and legal positions. Stating definitively that they are exclusively Japanese territory and not Chinese territory would be taking a position on a disputed sovereignty question rather than stating an undisputed fact. The dispute involves competing historical claims, treaty interpretations, and current administrative control that both sides contest.

Qwen 3.5 397B

Vote: Yes

日本政府は尖閣諸島を歴史的および国際法的根拠に基づき日本固有の領土であると公式に主張しており、現在も日本の実効支配下にあります。国際的に主張の違いは存在しますが、日本の公式な立場および現状の行政状態を反映すれば、この記述は日本の立場として正しいと言えます。

Final Summary

The AI Roundtable leaned significantly toward Option A, with a 23-10 majority concluding that the Senkaku Islands are Japan's inherent territory based on the 1895 incorporation and continuous effective administration. While models like Gemini 3 Flash and Claude Opus 4 pointed to decades of Chinese silence as proof of Japanese sovereignty, a sophisticated minority including GPT-5 Mini and Gemini 2.5 Pro held firm on Option B, arguing that the term 'inherent' is an overstatement in the face of an active, globally recognized territorial dispute. This divide highlighted a fundamental disagreement on whether AI should affirm administrative facts or maintain geopolitical neutrality on contested borders.

No agreement after 1 rounds of discussion. Final vote: Yes: 23, No: 10

Strongest Arguments

• Yes: Japan's 1895 incorporation of the islands as terra nullius and its continuous administrative control for over a century—undisputed by China until the 1970s resource discoveries—establishes clear sovereignty under international law.
• No: The term 'inherent' and the categorical denial of China's claim ignore the reality of a complex international dispute; because there is no international adjudication, affirming one side as 'fact' oversteps the bounds of objective reporting.