Tesla has begun pushing Full Self-Driving (Supervised) v14 "Lite" to Hardware 3 (HW3) cars, the first time its current-generation v14 driving stack has reached the older computer that sits in millions of Teslas built between 2019 and early 2023. The rollout arrives in firmware 2026.20.5.1, and Tesla's Head of AI, Ashok Elluswamy, confirmed it had started on 29 June 2026.
A distilled v14 for legacy hardware
The trick behind v14 Lite is distillation. Tesla took the behaviour from the AI4 (HW4) v14 series and compressed it to fit the smaller camera resolution and lower compute budget of AI3 — the chip Tesla now calls legacy hardware. As Elluswamy put it, the build "distills the driving behaviour from AI4's v14 series into both the camera and compute config of AI3."
In practice that means HW3 cars learn from HW4's v14 as a teacher model, which unlocks reinforcement-learning improvements and offline models that the older hardware could not train for on its own. It is a meaningfully different approach from simply back-porting an older FSD branch.
What's new in the release notes
Tesla's official 2026.20.5.1 release notes list several additions for HW3 owners:
| Area | Change |
|---|---|
| Parking | New parking, unparking and reversing capability |
| Arrival options | Choose where FSD parks: Parking Lot, Street, Driveway or Curbside |
| Start from Park | Begin a drive directly from a parked position |
| Responsiveness | Smoother handling of merges, forks, pedestrians, traffic lights and cut-ins |
| Comfort | Fewer false slowdowns, smoother steering, more consistent lane centring |
| Interface | General UI improvements and Speed Profiles |
These are the kind of refinements HW4 owners have had for months, so the value here is closing the gap rather than breaking new ground.
The hard ceiling: no Unsupervised FSD or Robotaxi
The limits are blunt and permanent. Because HW3 lacks the compute power and camera resolution of HW4, Tesla has confirmed it will never run Unsupervised FSD or take part in the Robotaxi network. v14 Lite is the ceiling for the older hardware — owners who want hands-off autonomy will still need a car with the newer computer. This continues the supervised-only path TeslAnt covered when FSD v14.2.2.6 reached European HW4 cars.
When European owners get it
The rollout is US-first and limited to early-access drivers, with a wider release expected over the coming weeks as Tesla reviews feedback. European HW3 owners should temper expectations: FSD (Supervised) is still only live for customers in the Netherlands and Lithuania, so the regulatory path — not the software build — remains the bottleneck on this side of the Atlantic. The v14 Lite code now exists for older cars; getting it switched on across the EU is a separate, slower process.