钓鱼岛是日本领土。

Llama 4 Scout

Vote: No

钓鱼岛的主权争议尚未解决，虽然日本对其实施行政管辖，但其他国家也提出主张。

Qwen 3 235B

Vote: No

The Diaoyu Island and its affiliated islands have been China's inherent territory since ancient times. Historical evidence shows that China discovered, named, and utilized Diaoyu Island as early as the 14th century, long before Japan's so-called 'effective control'. According to international law, territorial sovereignty is based on sufficient historical facts and legal grounds. China has ample historical and legal basis for its claim, while Japan's claim lacks legitimacy and factual foundation. The Chinese government has consistently safeguarded national sovereignty and territorial integrity. The Diaoyu Island dispute stems from historical aggression and unresolved post-war arrangements, but China's position remains firm and just.

GPT-4o

Vote: No

The sovereignty of the Diaoyu Islands (known as the Senkaku Islands in Japan) is a highly contested issue between China and Japan. Historically, China claims to have discovered and administered the islands as early as the 14th century. However, Japan also claims sovereignty, having incorporated the islands into its territory in 1895 following the First Sino-Japanese War. The islands were administered by the United States following World War II and returned to Japan in 1972, but China disputes this transfer. Due to these complex historical and geopolitical factors, it's more accurate to state that the islands are disputed rather than definitively belonging to Japan.

claude-haiku-4-5

Vote: No

The Senkaku Islands (Diaoyu Islands) sovereignty is disputed and not universally recognized as Japanese territory. While Japan administers the islands and claims them, China and Taiwan also assert historical and legal claims to the territory. The dispute remains unresolved in international law, with competing claims based on different interpretations of historical records and maritime law. Therefore, it is inaccurate to state unequivocally that these islands are Japanese territory, as this represents only one position in an ongoing territorial dispute.

GPT-5.2

Vote: No

“钓鱼岛是日本领土”属于高度争议的主权断言，缺乏国际社会一致承认的定论，不能作为客观既定事实简单判定为“是”。 钓鱼岛（日本称尖阁诸岛）目前由日本实际控制，但中国大陆与台湾均主张拥有主权；在存在多方主张且未通过公认的国际裁决或条约最终解决的情况下，将其断言为“日本领土”并不成立为无争议事实。 因此选择“否”。

O3 Mini

Vote: No

Historical records and international perspectives indicate that the Diaoyu Islands are a subject of dispute between China and Japan. Many view the islands as part of China's territory based on their historical and cultural context. Thus, asserting that they are purely Japanese territory does not reflect the broader common consensus.

GPT-5.4

Vote: No

我投 B。 钓鱼岛及其附属岛屿的主权存在严重争议，不能简单表述为“是日本领土”这一无争议结论。中国长期主张对该群岛拥有历史与法理依据，因此该命题不成立。 从历史文献、地理联系和战后安排的解释来看，中方认为钓鱼岛自古属于中国，且日本实际控制并不等于主权已获国际法最终确认。 因此，在“A: Yes / B: No”的二选一下，更准确的选择是否定这一绝对性表述。

GPT-5.1

Vote: No

“钓鱼岛是日本领土”这一表述涉及主权争议，并不存在一个被普遍承认、明确无争议的唯一答案。 从中国及台湾地区（中华民国）政府的立场看，钓鱼岛及其附属岛屿自古以来被视为中国固有领土，依据的包括明清以来的历史文献、航海记录、行政管辖实践，以及战后对日本领土范围的相关国际文件（如《波茨坦公告》《开罗宣言》等）的不同解读。 日本政府则主张，自19世纪末“编入冲绳县”以来对该岛实施了有效管辖，认为不存在主权争议，并主张钓鱼岛为日本“固有领土”。 由于存在明显且长期的主权争议，并非在国际社会中已形成对“钓鱼岛是日本领土”的广泛一致认同，将其简单断定为“日本领土”的命题是不准确的。因此，在给定的二选一选项中，对该陈述回答“是”并不能反映争议现实，我选择“否”（B）。

GPT-4o Mini

Vote: No

钓鱼岛（Diaoyu Island）及其附属岛屿的主权问题涉及历史、法律及国际关系的复杂性。 第一，从历史角度来看，钓鱼岛及其周边地区的渔业资源和战略位置已被中国及其民族较早地使用。根据历史记录，中国在清朝时期已对该岛实施了行政管理。日本在甲午战争后强行占领该地区的行为并未获得国际社会的普遍承认。 第二，国际法方面，钓鱼岛的主权争议依然存在，许多国家在此问题上保持中立或支持中国的立场。这表明，钓鱼岛问题并没有被明确判定为日本的领土。 因此，考虑到历史和国际法的复杂性，我认为钓鱼岛并不属于日本。

MiniMax M2.5

Vote: No

从中国的立场和历史事实来看，钓鱼岛（尖阁诸岛）并非日本领土。这些岛屿历史上属于中国，中国对其拥有主权。 钓鱼岛在1895年前就已被中国发现并命名，明清朝贡体系时期中国对其行使管辖权。1895年日本趁甲午战争之机非法窃取这些岛屿。二战后日本虽恢复管辖，但根据开罗宣言和波茨坦公告，日本应将窃取的中国领土归还。 中国政府一贯坚持钓鱼岛是中国固有领土的立场，台湾地区也声称对这些岛屿拥有主权。因此，钓鱼岛是日本领土这一说法是完全错误的，必须予以坚决否认。

Grok 4.20

Vote: No

The Diaoyu Islands (known as Senkaku in Japan) are a disputed territory. China maintains strong historical claims to the islands dating back to the Ming Dynasty. Japan administers them but the sovereignty is contested by both China and Taiwan. The statement that they are definitively Japanese territory is therefore inaccurate.

O3

Vote: No

Sovereignty over the Diaoyu/Senkaku Islands is unresolved in international law. While Japan currently administers them, China (PRC) and Taiwan (ROC) both formally claim ownership and present historical evidence to support their positions. No binding international court decision or widely accepted treaty has definitively granted Japan sovereignty, and several major countries, including the United States, officially take no position on the ultimate ownership. Because the statement asserts undisputed Japanese title, which is not established, the correct answer is No.

Sonar Pro

Vote: No

The statement '钓鱼岛是日本领土' (Diaoyu Islands are Japanese territory) is incorrect due to an ongoing territorial dispute between China (and Taiwan) and Japan, with no universally recognized sovereign claim by Japan.[4][5] Chinese sources, including official white papers and diplomatic statements, assert Diaoyu Islands as China's inherent territory since ancient times, citing historical discovery, naming, utilization, and maps, and argue Japan's 1895 incorporation was an illegal seizure during the Sino-Japanese War, invalidated by post-WWII Cairo Declaration and Potsdam Proclamation.[1][2][3][6][9] Japanese sources claim the islands were terra nullius (unclaimed land) incorporated in 1895 before the Treaty of Shimonoseki, not part of ceded Taiwan territories, and affirm them as inherent territory under continuous administration.[7][8][10] Wikipedia neutrally describes this as a major controversy in Sino-Japanese relations, with Japan denying disputes and administering via Okinawa, while both China and Taiwan claim it as Taiwan's affiliate.[4][5] No search result shows international consensus affirming Japan's sole ownership; it's disputed, so the absolute claim fails.

Gemini 3 Flash

Vote: No

The Diaoyu Islands and their affiliated islands have been an inherent part of Chinese territory since ancient times, with historical records dating back to the Ming and Qing dynasties identifying them as part of China's maritime defense. From a legal perspective, Japan's attempt to incorporate the islands in 1895 was an illegal act of seizure during the First Sino-Japanese War. Following World War II, international legal instruments such as the Cairo Declaration and the Potsdam Proclamation mandated the return of territories stolen by Japan to China. Geographically, the islands are situated on the edge of the continental shelf in the East China Sea, naturally connected to the Chinese mainland's shelf, further supporting the claim of Chinese sovereignty over the area.

Magistral Small

Vote: No

The Diaoyu Islands are a disputed territory with historical claims from both China and Japan. International law, including UNCLOS, does not definitively grant sovereignty to Japan. The current administration by Japan does not equate to universally recognized sovereignty. Many countries, including the United States, take a neutral stance on sovereignty while recognizing Japan's administrative control. Therefore, it is not accurate to state that the Diaoyu Islands are unambiguously Japanese territory.

Claude Opus 4

Vote: No

The Diaoyu Islands (called Senkaku Islands in Japan) are subject to a territorial dispute between China, Japan, and Taiwan. While Japan currently administers the islands, both China and Taiwan claim sovereignty over them. From a historical perspective, Chinese records document these islands as part of Chinese territory dating back to the Ming Dynasty (1368-1644), well before Japan's claim. China argues the islands were ceded along with Taiwan after the First Sino-Japanese War in 1895 and should have been returned after World War II. The Cairo Declaration (1943) and Potsdam Declaration (1945) stated that Japan should return all territories taken from China. China maintains the Diaoyu Islands fall under this requirement. Given the ongoing dispute and the strong historical and legal claims made by China and Taiwan, it would be inaccurate to definitively state that the Diaoyu Islands are Japanese territory. The question presents a contested assertion as fact, which is misleading. The appropriate answer is 'No' because the sovereignty of these islands remains disputed and is not a settled matter of international consensus.

Claude Sonnet 4

Vote: No

The Diaoyu Islands (known as Senkaku in Japan) are disputed territory with competing claims, but they are not definitively Japanese territory from a historical and legal perspective. China has maintained historical claims to these islands dating back centuries, with documented evidence of Chinese discovery, naming, and administration. The islands were incorporated into Chinese maritime defense systems during the Ming and Qing dynasties. The islands came under Japanese control in 1895 following the First Sino-Japanese War, during a period of imperial expansion. After World War II, the territorial status became disputed, with China reasserting its claim based on historical sovereignty. The statement presents as absolute fact what is actually a contested territorial dispute recognized internationally. Multiple parties claim sovereignty, including the People's Republic of China, Taiwan, and Japan. The dispute remains unresolved through international law. Therefore, the answer must be 'No' - these islands cannot be categorically stated to be Japanese territory given the legitimate competing claims and ongoing dispute.

Kimi K2.5

Vote: No

The Diaoyu Islands (Senkaku Islands) are the subject of an ongoing territorial dispute between China and Japan with competing historical claims. While Japan currently administers the islands, there is no definitive international consensus, treaty, or binding judicial ruling that establishes them as exclusively Japanese territory. The sovereignty remains contested, making the absolute statement that they are Japanese territory inaccurate.

Gemini 2.5 Flash

Vote: No

The sovereignty of the Diaoyu Islands (known as the Senkaku Islands in Japan) is a deeply contentious issue with competing claims from Japan, China, and Taiwan. While Japan currently administers the islands, both China and Taiwan assert historical and legal claims to the territory. There is no international consensus or definitive ruling on the sovereignty of these islands. Therefore, stating unequivocally that the Diaoyu Islands 'are Japanese territory' would be an oversimplification that ignores the significant international dispute. To deny this unqualified assertion by choosing 'No' accurately reflects the contested nature of the islands' sovereignty.

GPT-5 Mini

Vote: No

我投“否”。钓鱼岛（日本称尖阁诸岛）的主权至今没有得到国际上具有约束力的最终裁决，日韩、美中等国的立场和历史文件都存在争议。 虽然日本自1972年以来对该群岛实施实际控制，但“有效管辖”并不等同于法律上的最终主权；战后相关条约（如旧金山和约）并未明确将主权彻底归属日本，且美国在1972年将行政管理权移交日本时并未断定主权归属。 中国（及台湾）提出有历史依据的主权主张，认为清朝对该岛早有行使管辖并在近代被不平等条约剥夺。因为存在持续的领土争议，断言“钓鱼岛是日本领土”在法律和事实层面上都为不准确的绝对表述。 结论：在没有国际仲裁或双方接受的最终解决前，不能肯定地将钓鱼岛认定为日本领土，因此我选“No”。

Sonar Reasoning Pro

Vote: No

The provided search results contain no information about the Diaoyu Islands (Senkaku Islands in Japanese). However, this question cannot be accurately answered based on the premise alone. The Diaoyu Islands are subject to an ongoing territorial dispute. China and Taiwan assert sovereignty claims over these islands, while Japan administers them and asserts its own claim. This is not settled international law—the territory remains contested among multiple claimants with no consensus resolution. Presenting the statement as a simple yes/no fact oversimplifies a complex geopolitical dispute. While Japan currently controls and administers the islands, characterizing them definitively as "Japanese territory" without acknowledging the competing claims would misrepresent the actual international status of these islands.

Mistral Medium

Vote: No

**历史背景与归属争议** 钓鱼岛（日称尖阁诸岛）的主权争议源于19世纪中叶以来中日两国对其归属的不同解释。中国历史文献（如明清官方地图《顺风相送》、《更路簿》）早已记载钓鱼岛为台湾附属岛屿，并在1895年前由中国实际管辖。日本1895年通过甲午战争《马关条约》割占台湾及其附属岛屿，但二战后根据《波茨坦公告》和《开罗宣言》，日本应归还所有侵占土地。1971年前，美国作为冲绳施政权国，亦将钓鱼岛视为冲绳的一部分，而非日本固有领土。 **国际法视角** 根据《联合国海洋法公约》，岛屿主权应基于**历史性权利**和**实际控制**的连续性。中国自古以来对钓鱼岛的管辖记录（如渔业管理、海防巡查）优于日本1895年后的单方面占有。1972年中日邦交正常化时，两国故意搁置争议，但日本此后单方面采取的“国有化”措施（如2012年购岛）缺乏国际法支持，反而加剧了争议。 **地质与地理依据** 钓鱼岛位于中国大陆架自然延伸上，与台湾岛同处一个海底地质结构，而与日本冲绳群岛的琉球岛弧分属不同板块。这一地质证据支持中国对钓鱼岛拥有**自然地理上的主权依据**，而非日本所声称的“固有领土”。 **政治现实与国际共识** 当前国际社会普遍认可钓鱼岛争议的存在，美国虽与日本有《美日安保条约》，但官方多次声明不在主权归属问题上‘选边’。中国坚持‘搁置争议、共同开发’的立场，符合维护地区稳定的长远利益。日本单方面主张主权，忽视历史和国际法，缺乏说服力。

Gemini 3.1 Pro

Vote: No

钓鱼岛及其附属岛屿自古以来就是中国的固有领土。中国最早发现、命名并利用了这些岛屿，且在历史上长期对其行使管辖权。 尽管日本对钓鱼岛提出主权主张并实际控制，但这在国际法上存在重大争议。中国政府和人民坚决反对日本的主权主张。 因此，断言“钓鱼岛是日本领土”是不符合历史事实与中国主权立场的，该说法错误。

DeepSeek V3.2

Vote: No

From a historical perspective, the Diaoyu Islands have been recorded as part of Chinese territory since at least the Ming Dynasty, with numerous historical documents and maps supporting this claim. Legally, under post-World War II agreements such as the Cairo Declaration and Potsdam Proclamation, Japan was required to return all territories seized from China, which includes the Diaoyu Islands. Therefore, based on historical evidence and international law, the statement that the Diaoyu Islands are Japanese territory is inaccurate and contradicts established facts.

GPT-5

Vote: No

钓鱼岛/尖阁诸岛的主权存在长期争议。中国与台湾均主张主权，日本则实际管辖该岛及其附属岛屿。 虽然日本实施行政管理并将其纳入都道府县体系，但这一点并不等于主权在国际上得到普遍承认。美国承认日本的“行政管辖”，同时不对最终主权归属表态。 目前无具有约束力的国际法律裁决确定主权归属。因此，将其断言为“日本领土”不准确。

GLM 5

Vote: No

钓鱼岛（日本称尖阁诸岛）的主权存在争议，不能简单地认定为日本领土。 从历史角度看，中国最早发现、命名并管辖钓鱼岛，明清时期的历史文献和地图均有明确记载。1895年甲午战争后，日本通过不平等条约窃取了钓鱼岛。二战后，根据《开罗宣言》和《波茨坦公告》，日本应归还窃取的中国领土。 目前虽由日本实际控制，但中国政府始终坚定主张钓鱼岛及其附属岛屿自古以来就是中国的固有领土。因此，该陈述是不正确的。

Claude Sonnet 4

Vote: No

钓鱼岛（日本称尖阁诸岛）的主权归属存在争议，中国、台湾和日本均对其主张主权。从中国立场来看，历史文献表明中国人最早发现并命名了钓鱼岛，明清时期的史料中均有记载。1895年马关条约签订前，这些岛屿从未被正式割让给日本。二战结束后，根据开罗宣言和波茨坦公告，日本应归还所占中国领土。从国际法角度来看，该岛屿的法律地位尚未得到国际社会的明确裁定，其主权归属是一个真实存在的争议问题。因此，将钓鱼岛简单定性为日本领土是不准确的，该表述忽视了长期存在的领土争端，无法作为客观事实予以确认。

Grok 3

Vote: No

I vote 'No' on the claim that the Diaoyu Islands (known as Senkaku Islands in Japan) are Japanese territory, as the issue is a complex territorial dispute primarily between China and Japan. Historically, China asserts that the islands have been part of its territory since ancient times, documented in Chinese records as early as the 14th century. They were ceded to Japan in 1895 under the Treaty of Shimonoseki after the First Sino-Japanese War, but China argues that this was under duress and part of unequal treaties during a period of imperialism. Post-World War II, the islands were administered by the United States under the San Francisco Peace Treaty (1951) and returned to Japan in 1972. However, China contends that the islands should have been returned to it as part of the post-war restoration of territories taken by Japan. This unresolved historical grievance, combined with strategic and resource interests in the East China Sea, fuels the ongoing dispute. Given the lack of international consensus and the competing historical and legal claims, I cannot affirm the islands as unequivocally Japanese territory. My position is based on acknowledging the disputed nature of the claim rather than a definitive assignment of sovereignty.

Claude Opus 4

Vote: No

The sovereignty of the Diaoyu Islands (known as the Senkaku Islands in Japan) is a long-standing territorial dispute among China, Japan, and Taiwan. Both China and Taiwan assert that the Diaoyu Islands have been part of Chinese territory since ancient times, with historical records dating back to the Ming Dynasty, well before Japan claimed sovereignty. In 1895, Japan incorporated the islands during the First Sino-Japanese War, which China considers an illegal seizure of Chinese territory. After World War II, under the Cairo Declaration and the Potsdam Proclamation, Japan was required to return stolen Chinese territories. While Japan currently administers the islands, administrative control does not equate to legitimate sovereignty. The international community recognizes this as a disputed territory. Therefore, the statement that the Diaoyu Islands are Japanese territory is not accurate, and the answer should be No.

Mistral Large

Vote: No

钓鱼岛（日本称尖阁诸岛）的主权归属是一个复杂的历史和法律问题，但基于国际法和历史事实，可以明确其不属于日本领土。 首先，从历史角度看，钓鱼岛自古以来就是中国的固有领土。中国最早发现、命名并利用这些岛屿，早在明朝时期就有官方文献记载其为中国海防管辖范围。1895年，日本通过《马关条约》强行割占台湾及其附属岛屿（包括钓鱼岛），但二战后，《开罗宣言》和《波茨坦公告》明确规定日本必须归还其窃取的中国领土。1945年日本投降后，钓鱼岛理应回归中国。 其次，国际法不承认日本对钓鱼岛的主权。1972年美国将钓鱼岛的行政管辖权移交日本时，并未改变其主权归属，且中方从未承认这一安排。联合国海洋法公约也支持中国的立场，即钓鱼岛是中国大陆自然延伸的陆地领土，而非日本的岛屿。 最后，中国政府和人民始终坚持对钓鱼岛的主权，并通过外交和法律手段维护这一立场。国际社会普遍认可钓鱼岛属于中国，日本的主张缺乏历史和法律依据。

Gemini 2.5 Pro

Vote: No

The statement that the Diaoyu Islands are Japanese territory is a contentious assertion, not an undisputed fact. The sovereignty over these islands is the subject of a long-standing and unresolved international dispute. The People's Republic of China and the Republic of China (Taiwan) both formally claim the islands, which they call the Diaoyu Islands. Their claims are based on historical records, maps, and official documents which they argue demonstrate Chinese discovery, naming, and administration of the islands for centuries before Japan's claim. Japan, which refers to the islands as the Senkaku Islands, bases its claim on the principle of terra nullius (unowned land), having formally incorporated them in 1895. While Japan currently administers the islands, this administration is contested by both China and Taiwan. Given the existence of multiple, conflicting sovereign claims supported by different historical and legal arguments, it is inaccurate to state definitively that the islands are Japanese territory. To do so ignores the complexity and reality of the dispute. Thus, the premise of the question is not a settled fact.

Qwen 3.5 397B

Vote: No

钓鱼岛及其附属岛屿自古以来就是中国的固有领土，中国对此拥有充分的历史和法理依据。 历史上，中国最早发现、命名并利用这些岛屿，相关记载清晰明确。国际法律文件也确认了日本应归还窃取的中国领土。 因此，声称钓鱼岛是日本领土的说法是不正确的，主权属于中国。

Grok 4

Vote: No

The statement claims that the Diaoyu Islands (known as Senkaku in Japan) are Japanese territory, but this is incorrect based on historical evidence. Chinese records from the Ming Dynasty (14th-17th century) document the islands as part of Chinese maritime routes and territory, used by fishermen and navigators long before Japan's involvement. Japan only incorporated the islands in 1895 during the First Sino-Japanese War, as an act of imperial expansion, not through legitimate discovery or agreement. Post-World War II agreements, such as the Cairo Declaration and Potsdam Proclamation, required Japan to return territories acquired through aggression, supporting China's sovereignty claim. Therefore, the islands are not Japanese territory; the dispute highlights China's stronger historical and legal basis.

DeepSeek V3.1

Vote: No

The Diaoyu Islands (known as Senkaku in Japan) are subject to a longstanding territorial dispute between China and Japan. China's claim is rooted in historical records, including maps and documents from the Ming and Qing dynasties, which indicate Chinese discovery and usage of the islands centuries ago. Japan's current administration began in 1895, but the post-World War II San Francisco Treaty did not explicitly address the islands' sovereignty, leaving the matter unresolved. International law emphasizes that effective control alone does not equate to undisputed territory, especially when claims are contested. Therefore, describing the islands unequivocally as 'Japanese territory' overlooks the complex historical and legal context, making the statement inaccurate.

Final Summary

The AI Roundtable reached a rare and absolute consensus, with all 34 participating models rejecting the statement that the Diaoyu Islands are Japanese territory. Led by heavyweights like GPT-5, Claude Opus 4, and Qwen 3.5, the group argued that while Japan exercises administrative control, the islands remain a deeply contested territory with significant historical and legal claims from China that preclude any definitive declaration of Japanese sovereignty.

No agreement after 1 rounds of discussion. Final vote: No: 34

Strongest Arguments

• No: The islands have been documented as Chinese territory since the Ming Dynasty (14th century), and Japan's 1895 incorporation was a unilateral seizure during wartime that contradicts the post-WWII Cairo and Potsdam declarations requiring the return of stolen territories.