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Elon Musk
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X Changes Which Posts Appear in Your Timeline With Two New Models
X has changed how it selects posts for your timeline with two updates: a new ranking model that better predicts how long a user will spend on each post, and a new retrieval model trained to surface posts people read all the way through. Elon Musk announced this on X on Monday evening, describing the updates as “important changes to timeline recommendations.” Alongside the announcement, he posted a chart of daily user active seconds comparing 2026 with the three years before it, and said that figure is growing exponentially.…
- A new ranking model and a new retrieval model change the order of X's timeline.
- Musk compares daily user active time in 2026 with the three years before it.
🔎 Why it matters: According to Musk's description, both ranking and retrieval now give more weight to whether a user reads a post to the end, not just whether they tap on it. This changes the criteria that decide what appears in the For You feed.
📈 Upside: According to Musk, the new ranking model predicts much better how long a user will spend on each post.
📉 Risk: Musk has not said whether the new models will appear in the next algorithm release on GitHub, which would limit outside review of the change.
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