Each fact is a sentence from a source that at least two independent outlets report.
Facts with links, quotes, contradictions, unknowns, changes between versions and a suggested text length. On the Business plan there is a refined layer: Claude turns the sources into atomic facts with verbatim quotes and a short summary.
How it works PricingThe same group number means one site, one wire agency or a near-verbatim reprint: such articles count as one independent source.