It’s far past what they call “beta” - the correct term to describe the releases available now is “Unity 6 Preview” which is equivalent to being 2023.3 Tech Stream (beta releases for this were 6000.0.0bX, now we’re on 6000.0.XfY). This will eventually be succeeded by Unity 6 proper (equivalent 2023.4 LTS).
A closer name is suggested to be “release candidate“ but they claim “Preview” fits because they keep patching it to make it more stable before general availability, though they also say its production supported right now anyway.