A instance I have access to is at 6.5-OD-08-001. This was released July 5th through July 11th.
You can find this information and more under What's New in JIRA Cloud documentation.
It's also on your system information page, and you can rely on it being "the latest" - Atlassian roll out the latest version to Cloud all the time, it's one of the selling points.
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