Lenovo - ThinkPad X9 14 Gen 1 vs ASUS - Zenbook S 14 UX5406
Between the ThinkPad X9 14 Gen 1 and Zenbook S 14 UX5406, the ThinkPad X9 14 Gen 1 comes out ahead in several specs, while the Zenbook S 14 UX5406 wins on battery / claimed battery life. Overall, the ThinkPad X9 14 Gen 1 scores 59.4 and the Zenbook S 14 UX5406 scores 64.2 on our Mars Score.
Which should you buy?
The Zenbook S 14 UX5406 edges ahead on the Mars Score (59.4 vs 64.2), but the 4.8-point gap is small enough that the right pick comes down to which spec advantages matter to you.
The ThinkPad X9 14 Gen 1 does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the Zenbook S 14 UX5406 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. Its strongest claims are battery, claimed battery life, weight.
Both ship with comparable ram, storage, screen size, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Why Lenovo - ThinkPad X9 14 Gen 1 wins
- No decisive advantages.
Why ASUS - Zenbook S 14 UX5406 wins
- ▲Battery — 30.91% more. 72 Wh vs 55 Wh.
- ▲Claimed battery life — 14.29% more. 16 h vs 14 h.
- ▲Weight — 0.07 kg less. 1.20 vs 1.27.
Spec comparison
Design
| Spec | Lenovo - ThinkPad X9 14 Gen 1 | ASUS - Zenbook S 14 UX5406 |
|---|---|---|
| Weight | 1.27 kg | 1.20 kglead |
| Thickness | 13.8 mm | 11.9 mmlead |
| Build material | aluminum | ceraluminum |
| Backlit keyboard | true | true |
| Fingerprint reader | true | true |
Display
| Spec | Lenovo - ThinkPad X9 14 Gen 1 | ASUS - Zenbook S 14 UX5406 |
|---|---|---|
| Screen sizeⓘ | 14 " | 14 " |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Panel typeⓘ | OLED | OLED |
Performance
| Spec | Lenovo - ThinkPad X9 14 Gen 1 | ASUS - Zenbook S 14 UX5406 |
|---|---|---|
| CPU | Intel Core Ultra 7 268V | Intel Core Ultra 7 258V |
| CPU cores | 8 | 8 |
| GPUⓘ | Intel Arc Graphics 140V | Intel Arc 140V |
| RAMⓘ | 32 GB | 32 GB |
| Storageⓘ | 1024 GB | 1024 GB |
| Storage typeⓘ | SSD | SSD |
Battery & Ports
| Spec | Lenovo - ThinkPad X9 14 Gen 1 | ASUS - Zenbook S 14 UX5406 |
|---|---|---|
| Batteryⓘ | 55 Wh | 72 Whlead |
| Claimed battery life | 14 h | 16 hlead |
| USB-C ports | 2 | 2 |
| Thunderbolt portsⓘ | 2 | 2 |
| HDMI | false | truelead |
Frequently asked
Which has better battery life, ThinkPad X9 14 Gen 1 or Zenbook S 14 UX5406?+
Zenbook S 14 UX5406 claims up to 16 hours — 14h vs 16h.
Which is lighter, ThinkPad X9 14 Gen 1 or Zenbook S 14 UX5406?+
Zenbook S 14 UX5406 is lighter at 1.20 kg vs 1.27 kg.
Which has an OLED display, ThinkPad X9 14 Gen 1 or Zenbook S 14 UX5406?+
Both have OLED displays.
Spec-level deep dives
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