Hi Varuna,
Eclipse 5.5.1 is the latest GA release. It supports Eclipse 3.2.2.
Eclipse 6.0m1 is later than that, but it is only a milestone release, but it is the first to support Eclipse 3.3. Eclipse 6.0GA is currently scheduled for August according to the roadmap, but the roadmap used to change, so that is nowhere sure to be released in August (actually it was originally scheduled for July, which it did not meet).
Best regards,
Robert