Between the C5 OLED 55 and C5 OLED 65, the C5 OLED 55 comes out ahead in several specs, while the C5 OLED 65 wins on screen size. Overall, the C5 OLED 55 scores 60.5 and the C5 OLED 65 scores 63.5 on our Mars Score.
Which should you buy?
The C5 OLED 65 edges ahead on the Mars Score (60.5 vs 63.5), but the 3.0-point gap is small enough that the right pick comes down to which spec advantages matter to you.
The C5 OLED 55 doesn't pull ahead on any single popular-comparison spec — its strengths sit in the spec table groups rather than the headline advantages.
Pick the C5 OLED 65 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are screen size.
Both ship with comparable panel type, refresh rate, peak brightness, so those specs don't 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 tells you both are well-rounded; the differences are about trade-offs, not quality.
Why LG - C5 OLED 55 wins
- No decisive advantages.
Why LG - C5 OLED 65 wins
- ▲Screen size — 18.18% more. 65 " vs 55 ".
Spec comparison
Display
| Spec | LG - C5 OLED 55 | LG - C5 OLED 65 |
|---|---|---|
| Screen sizeⓘ | 55 " | 65 "lead |
| Panel typeⓘ | OLED | OLED |
| Resolutionⓘ | 4K | 4K |
| Refresh rateⓘ | 144 Hz | 144 Hz |
| Peak brightnessⓘ | 1300 nits | 1300 nits |
HDR & Smart
| Spec | LG - C5 OLED 55 | LG - C5 OLED 65 |
|---|---|---|
| Dolby Visionⓘ | true | true |
| HDR10+ⓘ | false | false |
| Smart OS | webOS | webOS |
| Dolby Atmosⓘ | true | true |
Gaming
| Spec | LG - C5 OLED 55 | LG - C5 OLED 65 |
|---|---|---|
| HDMI 2.1 portsⓘ | 4 | 4 |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, C5 OLED 55 or C5 OLED 65?+
C5 OLED 65 peaks at 1300 nits vs 1300 nits.
Which is better for gaming, C5 OLED 55 or C5 OLED 65?+
C5 OLED 55 offers 144Hz refresh and 4 HDMI 2.1 ports.
Does C5 OLED 55 or C5 OLED 65 support Dolby Vision?+
Both support Dolby Vision.
Spec-level deep dives
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