Arianespace hasn’t publicly disclosed the cost for an Ariane 6 launch.

In the two years since it made a largely successful debut, Europe’s Ariane 6 rocket has launched eight missions, all of which reached orbit safely.
The large, expendable rocket has a capacity of more than 20 metric tons to low-Earth orbit. And to the credit of European rocket scientists and planners, the Ariane 6 has had a substantially smoother rollout than comparable vehicles in the United States—Blue Origin’s New Glenn and United Launch Alliance’s Vulcan rockets—both of which have had significant growing pains.
However, even though the Ariane 6 rocket has had a successful debut, its future is clouded by high costs.Read full article
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Source: Ars Technica