Tesla HW3 vs HW4: What Buyers Should Know in 2026
Hardware matters, but “HW3 bad, HW4 good” is too simplistic. FSD eligibility and features depend on vehicle configuration, hardware, software and region, so buyers should verify the exact car they are considering.
Hardware 3 (HW3)
Older FSD computer and camera generation found in many used Teslas. Some vehicles remain eligible for FSD, but capabilities and future support can differ.
Hardware 4 (HW4 / AI4)
Newer camera and compute platform used in more recent Teslas, with substantially newer hardware for Tesla's current autonomy development.
Buying Used?
Check the exact build date, hardware configuration, current FSD eligibility and upgrade requirements instead of relying only on the model year.
Practical Buyer Rule
If two otherwise similar cars are available and autonomy is important to you, newer hardware gives you the cleaner path. But verify the specific vehicle rather than treating every HW3 car as unusable.