X Premium is the paid subscription on X, formerly Twitter Blue, that adds features such as longer posts, post editing, and a verification checkmark.
What X Premium includes
X offers Premium in tiers, and the exact features and prices change, so check X's own help center for current details. Features have included:
- Longer posts: subscribers can write posts far beyond the standard 280 characters, up to 25,000.
- Editing a post for a short time after publishing.
- A checkmark, subject to X's eligibility review.
- Reply prioritization and reduced ads on some tiers.
Without Premium, posts are limited to 280 weighted characters. X counts most Latin characters as 1, many CJK characters and emoji as 2, and every link as 23.
An example
A Premium account publishes a 1,200-character post in one piece. A standard account would need a 5-post thread to say the same thing.
Why it matters for AI-agent publishing
An agent needs to know which limit applies. If it assumes Premium and the account is standard, the API rejects the post. Long single posts also show only a preview in the feed, so a thread can still read better.
SocialHandoff counts X posts against the standard weighted 280-character limit and splits longer text into reply-chain threads, which work for every account. It supports up to 4 media items per post with chunked upload. Check your text with the X character counter, and see connect X and scheduling for X.