Keychron
Keychron K4 Ultra 8K
Released 2026
Researched from maker specs and published sources. Last checked Oct 18, 2026.
K4 Ultra 8K, from Keychron's store
The K4 Ultra 8K is the 96% with 8000 Hz polling, ZMK firmware, a steel plate and a 600-hour battery claim. No board-specific review was found.
Sources
Our take, based on research
A numpad 8 kHz board. Check ZMK compatibility first.
Overview
The K4 Ultra 8K is the high-polling 96%. Keychron lists 2.4 GHz plus Bluetooth plus wired with 8000 Hz polling, hot-swappable Keychron Apex switches (Red, Brown or Banana), an ABS case with a steel plate, OSA double-shot PBT keycaps, ZMK firmware with the Launcher web app, south-facing RGB, a 4000 mAh battery rated up to 600 hours and about 1241 g.
No review of this exact board could be opened. TechRadar's K2 Ultra 8K review, on the sibling, found a solid body, opaque keycaps that block the backlight, switches that actuated a little too deep, and good value, while Tom's Hardware's K3 Ultra review praised the 8 kHz polling and battery life. The ZMK firmware means QMK/VIA keymaps do not carry over.
Choose it over the K4 Max when polling rate matters and you accept ZMK.
Pros & Cons
- 8000 Hz polling and 2.4 GHz wireless (maker)
- Battery rated up to 600 hours
- Steel plate and OSA PBT keycaps
- Apex switches in three variants
- Sibling Ultra 8K boards were praised for value and battery life
- Runs ZMK instead of QMK/VIA, so existing keymaps do not carry over
- No board-specific independent review was found
- ABS case and heavy at about 1241 g
- Sibling reviews flagged opaque keycaps and deep actuation (TechRadar, K2 Ultra 8K)
- Tray mount is not stated by the maker
Who Is This For?
- Competitive players who want a numpad and 8 kHz wireless
- Users who value long battery life
- Buyers who prefer PBT keycaps
- QMK/VIA users who want to keep their existing layouts
- Buyers who need verified reviews of this exact board
- Anyone who wants an aluminum case
Where to Buy
Dimensions
391.29 x 140.27 mm
Weight
1241 g +/- 10 g
Case Material
ABS
Connectivity
Both
Plate Options
Case Colors
Software Support
Similar Keyboards
View all
Looking for something different?
Browse All Keyboards