Which cathedral's choir vault reaches 46 meters, the tallest Gothic vault ever built?

Beauvais Cathedral has the Gothic choir vault associated with the record height of roughly 46 metres or more, making it the accepted answer.

The French cathedral’s 13th-century choir was designed during a competition to build the most ambitious Gothic church. Its vaulting rises higher than that of other major Gothic cathedrals, surpassing Amiens Cathedral’s approximately 42-metre nave. Measurements vary by reference and by whether the interior choir or the broader structure is being described; figures around 47.5 to 48.5 metres are also reported.

That extreme ambition created serious structural problems. Part of the choir vault collapsed in 1284, and the building suffered another major disaster when its later tower collapsed in 1573. The planned nave was never completed, leaving Beauvais as an extraordinary but unfinished cathedral.

A common mix-up is to choose Amiens, which has a famous high Gothic nave, or Cologne, which is known for its huge completed towers. Beauvais is the record-holder for Gothic vault height.