Claim: The US government has released over 160 previously classified documents on unidentified aerial phenomena, covering more than 400 incidents dating back to the 1940s

The claim is mostly true as the US government has indeed released over 160 classified documents related to unidentified aerial phenomena (UAP), covering incidents from the late 1940s. This information is supported by multiple credible sources, including the Department of Defense and major news outlets. However, while the documents cover a significant number of incidents, the exact figure of over 400 incidents is not explicitly confirmed in the available evidence. Some skeptics may question the completeness of the data or the government's transparency regarding UAPs, but the release itself is well-documented and verifiable. The models diverge sharply — treat this as higher-uncertainty. Perplexity comes in highest (100%), while Gemini is lowest (50%). OpenAI expresses higher confidence than Gemini on this claim. While the evidence strongly supports the release of over 160 documents, the claim about covering more than 400 incidents is less clear. The sources confirm the release of documents dating back to the 1940s and mention unresolved cases, but do not provide a specific count of incidents. This lack of explicit confirmation leaves some uncertainty regarding the total number of incidents covered. Opposing views may argue that the government has not fully disclosed all relevant information, which could impact the perceived completeness of the claim, but the core assertion about the release is substantiated by reliable sources.