Tesla Autopilot Hardware Evolution

HW1 cars introduced many buyers to Tesla Autopilot. They can still be enjoyable used Teslas, but their hardware belongs to an earlier driver-assistance era.

• Used from roughly 2014-2016.
• Built around the Mobileye EyeQ3 system.
• Used one forward camera, forward radar, and ultrasonic sensors.
• Enabled early features such as traffic-aware cruise control, Autosteer, lane keeping, and Autopark.
• Limited by the lack of surround cameras and by much lower compute than later Tesla systems.
• Not a realistic path to modern FSD expectations.

Late-2016 AP2 cars marked a major architectural reset as Tesla moved away from Mobileye and began building around its own neural-network perception stack.

• Introduced in late 2016.
• Moved Tesla from Mobileye dependency toward Tesla-owned software.
• Used an 8-camera layout: 3 forward cameras, 2 side repeater cameras, 2 B-pillar cameras, and 1 rear camera.
• Kept forward radar and ultrasonic sensors.
• Used NVIDIA Drive PX2 compute.
• Some early AP2 cars had feature gaps while Tesla rebuilt software capability.

HW2.5 refined the AP2 platform before Tesla's own FSD computer arrived. It is common in early Model 3s and remains important in used Tesla evaluations.

• Used roughly from 2017-2019.
• Used an enhanced NVIDIA platform with improved redundancy.
• Helped enable Dashcam and Sentry Mode on many vehicles.
• Shared a broadly similar camera, radar, and ultrasonic sensor suite with HW2.
• Served as an important transitional platform before Tesla's in-house FSD computer.

HW3 brought Tesla-designed FSD compute into production and became the core hardware era for many used Teslas with FSD-era software expectations.

• Introduced around 2019.
• Used Tesla-designed FSD computer hardware with a large neural-network compute improvement over the NVIDIA generation.
• Included dual-chip redundancy.
• Enabled broader FSD Beta and FSD (Supervised) development.
• Used across Model 3, Model Y, and updated Model S/X vehicles.
• Early HW3 cars still had radar and ultrasonic sensors.

Tesla Vision describes Tesla's move toward camera-first Autopilot and FSD perception. It matters because two similar-looking HW3 cars may differ in radar hardware or active radar use.

• Around 2021, Tesla began removing radar from many Model 3/Y vehicles.
• Tesla later expanded the camera-based transition across more vehicles and markets.
• Early transition periods included reduced feature availability for some owners and complaints such as phantom braking.
• Tesla restored many capabilities through software updates over time.

The removal of ultrasonic sensors changed the parking-assist story for many newer Teslas. This is one of the easiest hardware differences to miss in listing photos.

• Around 2022, Tesla began removing ultrasonic parking sensors from new vehicles.
• Older cars have small circular sensors in the front and rear bumpers.
• Newer cars often have smooth bumpers and use vision-based park assist instead.
• USS was used for close-range parking distance measurement.
• Some parking and summon-related features were temporarily unavailable or degraded during the transition.

HW4 is the newer production autonomy hardware generation and is usually the strongest future-facing signal for buyers comparing late-model Teslas.

• Rolled out beginning around 2023.
• Uses a newer FSD computer, more memory and compute than HW3, and upgraded camera hardware.
• Associated with higher-resolution cameras and updated camera housings or sensor architecture.
• Used on newer Model S/X, newer Model Y, refreshed Model 3, and Cybertruck, with timing varying by model and market.
• Speckr should distinguish HW4 from HW3 in output when reliable data is available.

Tesla has discussed AI5/HW5 as a future-generation inference computer, but it should not be treated as a normal used-market feature today.

• Announced and discussed by Tesla as a future-generation AI computer.
• Not broadly deployed in current used-market vehicles.
• Expected to provide much higher compute than HW4.
• Final deployment timing, naming, vehicle fitment, and sensor details remain subject to change.