TransAct V2: 160× longer user-behavior sequence for ranking
Pinterest's home feed ranking model, TransAct V2, was upgraded to use a user's lifelong action sequence, up to ~16,000 actions, up from ~100 actions in the prior version. That's a 160× expansion of the user-behavior window. The model now understands long-term interests and revisits themes over months and years, not just the most recent browsing session.
What this means for you
Bigger effect on evergreen categories. Pinterest users who have shown interest in a topic over multiple months (e.g. wellness, home improvement, recipes) now get more precisely-matched Pins. For practices with content on Pinterest (aesthetic medicine, wellness, recovery lifestyle): building a topical Pin library over 6-12 months compounds significantly better than short bursts of Pin creation. Consistency in topic across months wins.
Real-time feed recommendations (no more retraining lag)
Pinterest's home feed now updates recommendations while you browse, rather than only after periodic model retraining. If a user saves or taps a Pin, the system reacts immediately and pushes similar Pins into the same session's feed. Removes the previous multi-day lag between behavior and recommendation shift.
What this means for you
Session-scoped signals now matter. If a Pinner starts a browsing session with an interest signal, clicking one of your Pins, the algorithm rapidly serves more like it. Optimization tip: publish Pins in themed batches (5-10 Pins on one topic scheduled close together) rather than one-off Pins, so a session-triggered interest can quickly surface multiple of yours.
Video Pin quota + content-type diversification in home feed
Pinterest tuned the home feed for content-type diversification. The algorithm now enforces minimum distribution quotas for each content type, for example, roughly 4% of a user's home feed is guaranteed to be video Pins, even for users who don't typically click videos. Similar quotas apply to Idea Pins and shopping Pins. Pinterest's goal is to expose users to more formats than their historical behavior alone would surface.
What this means for you
Practical effect: video Pins now compete in a smaller, protected pool. Video Pins have a much better chance of reaching non-video-inclined users than they used to. For practices with Pinterest presence: producing even a small volume of vertical video Pins (30-60 seconds, before/after style for aesthetic, testimonial style for wellness) captures a distribution surface that static image Pins can't reach.
