Update (September 2026): Eight Sleep replaced the Pod 5 with the Pod 6 on 23 September 2026 (from $1,999 Solo; $2,899 queen dual-zone). Pod 5 prices below are its last list prices — compare any remaining Pod 5 stock against Pod 6 pricing.
The short version
The Pod 5 Ultra is the fuller, pricier system; the Pod 4 is the value. The core sleep-climate tech and the new Autopilot 4.0 software are shared, so the upgrade question is really about the full-bed extras.
If you want the value
Buy the Pod 4. Dual-zone climate, HRV tracking and Autopilot 4.0 for less than half the Ultra’s price — most of what makes Eight Sleep great.
If you want the maximal system
Buy the Pod 5 Ultra. The adjustable base, top-down hydro blanket, built-in audio and automatic snore mitigation are real additions — worth it only if the price is not the deciding factor.
Either way
The Autopilot subscription applies to both. For the wider field of climate systems, see the best smart sleep-climate systems.