Twitter has updated its official Mac app with support for the longer, 10,000-character direct messages. Additionally, popular third-party Twitter client Tweetbot has also added the feature, along with Retina display performance improvements.
Previously, Twitter held direct messages to the same 140-character limit they place on standard tweets and replies. The company removed the limit from direct messages last week.
You can grab both Twitter and Tweetbot for Mac right now from the Mac App Store.