Xiaomi 12X review: specs, battery & used prices

Summary

The Xiaomi 12X is the 2021 compact flagship that sat just under the headline models of the number series, running the Snapdragon 870 in a 6.28-inch 120 Hz OLED with a 4500 mAh battery and a 176-gram body. Our catalog scores it 71 on everyday use, 20 on gaming and 94 on compactness — one of the most pocket-friendly flagships we measure. A 50-megapixel stabilized main camera records 8K24 video, and the 8/128 GB trim was tracked at about $650 new. The Xiaomi 12 is the standard sibling, and the Xiaomi 12S is the camera-corrected revision.

Display and design

The 6.28-inch OLED refreshes at 120 Hz and scores 56 on our screen axis, with a 500-nit brightness figure that suits indoor and shaded use rather than harsh direct sun. No ingress rating is documented. At 176 grams the body earns the compactness score of 94 — a flat, light frame that made the 12X one of the easiest flagships of its season to carry one-handed.

Performance

The Snapdragon 870 posts an everyday axis of 71 and a gaming axis of 20: near-flagship pace with the calmer thermal profile that kept this chip popular through 2021. Tracked trims run from 8 to 12 GB of RAM, and no software-window figure is documented for this model.

Camera

The camera axis of 37 rests on a 50-megapixel stabilized main sensor with an ultrawide and a telephoto companion, recording up to 8K24. OIS keeps the main sensor dependable in the shots that matter; the supporting pair is best treated as framing tools, and the compact body leaves little room for large sensor scale.

Battery and charging

The 4500 mAh battery scores 30 on our battery axis — a single full day for moderate use — and 67 W charging scores 48, refilling the smaller cell quickly enough that the capacity figure rarely becomes a planning item. The pairing of a light 176-gram body with this refill pace was the conscious trade of the model.

Verdict

At about $650 new for 8/128 GB, the Xiaomi 12X answers a narrow question: how much flagship does a truly compact body need? The answer was a great deal — 120 Hz, 8K video and 67 W refills in 176 grams. Used market data is sparse, so new-old-stock and residual listings are the realistic routes. The Xiaomi 12 adds charging pace, and the 12S corrects the camera.