It is often claimed that political disinformation is more abundant than ever, that populists are particularly prone to lying, and that we live in an era of post-truth or epistemic relativism. Contrary to these views, we interpret this historical trend as a shift from objective to authentic forms of political truth claims. We develop a diagnostic framework that captures different types of political truth claims and their distinct elements. This framework enables interrogation and understanding of the current state of epistemic contestation and change. The rise of both populist and deliberative approaches to democracy, which we use as key examples, are indicators of a gradual shift towards a greater importance of authenticity in the public sphere. We nuance this proposition by distinguishing between different forms of authenticity employed by populist and deliberative politics: communicative authenticity in deliberative politics and original and personal authenticity in populist politics.