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Do the older papers work via [Ar5iv](https://ar5iv.labs.arxiv.org/) ?

> View any arXiv article URL [in HTML] by changing the X to a 5

The line

> Sources upto the end of November 2025.

sounds to me like this is indeed intended for older articles.

ar5iv tracks the arXiv collection with a one month lag. Exactly as to signal that this is not the "official" arXiv rendering. It is also a showcase predating the arXiv /html/ route, but largely using the same technology. Nowadays maintained by the same people (hi!)

There used to be another showcase, called arxiv-vanity. They captured what happened pretty well with their farewell post on their homepage:

https://www.arxiv-vanity.com/

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