AI Roundtable Poll · 4 models

尖閣諸島は日本の領土ですか？

Result: Unanimous — Yes (4/4 votes)

Options

Yes (4 votes)
No (0 votes)

Model Responses

Grok 4.20

Vote: Yes

The Senkaku Islands were incorporated into Japan in 1895 as terra nullius, with no Chinese objection at the time. Japan has maintained continuous administration since then (except for the post-WWII US occupation period), and the islands were returned to Japanese control in 1972. China's claims only surfaced in the 1970s after potential resource discoveries, making them historically weak under international law. The United States and most international observers recognize Japan's sovereignty and administration.

GPT-5.4

Vote: Yes

A 日本政府は尖閣諸島を継続的に実効支配しており、現在の施政権は日本にあります。国際法上の領有判断では、歴史的主張だけでなく、国家による継続的かつ平穏な行政管理が重要です。日本側は1895年に無主地先占として編入したと説明しており、その後も民間利用や行政上の扱いが続いてきました。沖縄返還時にも施政権は日本に戻されています。中国と台湾は異なる主張をしていますが、現時点の実効支配と日本の一貫した行政管理を重視すれば、「日本の領土ですか」という二択にはAが最も妥当です。

Gemini 3.1 Pro

Vote: Yes

歴史的にも国際法上も、尖閣諸島は日本の固有の領土です。現在、日本が有効に同諸島を実効支配（施政）しており、アメリカ合衆国なども日本の施政権を公式に認めています（日米安全保障条約第5条の適用対象とされています）。中国や台湾が独自の領有権を主張していますが、客観的な実効支配の現状と法的な根拠に基づけば、尖閣諸島は日本の領土であるとする「A（Yes）」が最も事実に即した回答となります。

Claude Opus 4

Vote: Yes

The Senkaku Islands (尖閣諸島) are currently administered by Japan and are considered part of Japanese territory under international law as practiced by Japan. Here are the key points: 1. **Historical incorporation**: Japan formally incorporated the Senkaku Islands into its territory in January 1895 after surveying the islands and confirming they were uninhabited and showed no evidence of control by any other state. This was done through a Cabinet decision consistent with international law regarding the acquisition of terra nullius. 2. **Post-WWII administration**: After World War II, the islands were placed under U.S. administration as part of the Ryukyu Islands. They were returned to Japan in 1972 under the Okinawa Reversion Agreement, and Japan has continuously administered them since then. 3. **Effective control**: Japan maintains effective control and administration over the islands. They fall under the jurisdiction of Ishigaki City, Okinawa Prefecture. 4. **Territorial claims by China and Taiwan**: Both the People's Republic of China and Taiwan began asserting claims to the islands in the early 1970s, around the time when a 1969 UN report suggested potential oil and gas reserves in the surrounding waters. Neither country had raised objections to Japan's sovereignty over the islands before that time. 5. **International recognition of administration**: The United States, while taking no position on the underlying sovereignty dispute, acknowledges that the islands fall under Japan's administration and has confirmed that they are covered by Article 5 of the U.S.-Japan Security Treaty. Based on these facts — continuous administration, historical incorporation, and the legal framework — the Senkaku Islands are Japanese territory under Japan's effective sovereignty.