Tesla has started a wide rollout of software update 2026.38.5, which comes with FSD (Supervised) v14.3.12 for AI4 (HW4) vehicles and FSD v14.3 Lite for some HW3 cars. It also brings back a seasonal favourite: Halloween Mode.
Who’s getting it
Tesla Oracle reports that the update is going out only to HW4/AI4 vehicles and to HW3 vehicles that have the AMD Ryzen infotainment processor. Software tracker Teslascope said one wave of about 1,430 vehicles on October 12 was 92% AI4 cars on v14.3.12 and 8% Ryzen-equipped HW3 cars on v14.3 Lite. Not a Tesla App lists the release date as October 10, 2026.
What’s new in FSD v14.3.12
According to the published release notes, v14.3.12 includes:
- An upgraded reinforcement learning (RL) stage of neural network training, meant to improve behaviour across a wide range of driving scenarios.
- An upgraded vision encoder that improves understanding in rare and low-visibility conditions, strengthens 3D geometry understanding, and recognizes more kinds of traffic signs.
- An AI compiler and runtime rewritten from the ground up with MLIR. Tesla says this makes reaction time 20% faster and speeds up model iteration.
- Fixes for unnecessary lane biasing and minor tailgating.
- More decisive parking spot selection and manoeuvring, plus better prediction of parking location pins.
- Better responses to emergency vehicles, school buses and right-of-way violators.
HW3 owners aren’t left out
For eligible HW3 vehicles, FSD v14.3 Lite brings over some of the RL-driven improvements, with better responsiveness around pedestrians, traffic lights and vehicle cut-ins. It also adds parking capabilities. HW3 owners have been waiting a long time for meaningful updates, so this is good news. Keep in mind, though, that it’s limited to Ryzen-equipped cars.
Why it matters for Canadian drivers
Low-visibility performance is a big deal here, with fall rain and winter snow on the way. Wider traffic sign recognition matters too, since our signage, including bilingual signs in Quebec, doesn’t always look like what’s common in the U.S. We’d love to hear how v14.3.12 handles Canadian roads once it reaches your car.
As always, FSD (Supervised) requires an attentive driver who is ready to take over at any moment.