This Halloween, Tesla (TSLA) customers will have even more fun than in previous years. The automaker has prepared a fun n’ spooky free over-the-air software update (2026.38.5) that adds Halloween Mode to your Tesla vehicle.
Since rumors of Halloween Mode started a couple of weeks ago, Tesla owners have been anxiously waiting for this update and asking each other whether they got it first.
Tesla has paired the Halloween Mode update with a new version of its Full Self-Driving AI vision branch, FSD v14.3.12. The automaker has likely made some bug fixes and tweaks to the previous FSD v14.3.11 update that rolled out earlier this month (release notes below).
Halloween Mode is a themed light show, and the car also produces scary sounds (watch below). This mode has the biggest impact in a dark, eerie environment.
FSD v14.3.8 and Halloween Update Rollout Status
As of this writing, a limited number of users have installed the Halloween Update on their cars, you can watch a demo video below. However, Tesla is pushing a wide release to the fleet.
According to Tesla software tracking website Teslascope, the automaker has released a large wave of FSD v14.3.12 and 2026.38.5 (Halloween Mode update) today.
Just like the 2026.38 main branch update, the 2026.38.5 Halloween Update is going out only to Hardware 4 (HW4/AI4) and HW3 vehicles with the AMD Ryzen GPU.
Teslascope has traced that the recent wave (1,430 vehicles) consists of 92% HW4 and 8% HW3 (Ryzen only) Teslas.
Tesla Update 2026.38.5: Official Release Notes
Halloween Mode
Spread holiday fear year-round with Halloween Mode. Put a Ghost Costume on your car visualization. Turn on Trick or Treat Mode to play spooky sounds and flicker lights when visitors approach. Schedule a haunting light show, and turn your car into a chilling Photobooth!
Demo Video
Full Self-Driving (Supervised) v14.3.12 includes:
- Upgraded the Reinforcement Learning (RL) stage of training the FSD neural network, resulting in improvements in a wide variety of driving scenarios.
- Upgraded the neural network vision encoder, improving understanding in rare and low-visibility scenarios, strengthening 3D geometry understanding, and expanding traffic sign understanding.
- Rewrote the AI compiler and runtime from the ground up with MLIR2, resulting in 20% faster reaction time and improving model iteration speed.
- Mitigated unnecessary lane biasing and minor tailgating behaviors.
- Increased decisiveness of parking spot selection and maneuvering.
- Improved parking location pin prediction, now shown on a map with a (P) icon.
- Enhanced response to emergency vehicles, school buses, right-of-way violators, and other rare vehicles.
- Improved handling of small animals by focusing RL1 training on harder examples and adding rewards for better proactive safety.
- Improved traffic light handling at complex intersections with compound lights, curved roads, and yellow light stopping – driven by training on hard RL examples sourced from the Tesla fleet.
- Improved handling for rare and unusual objects extending, hanging, or leaning into the vehicle path by sourcing infrequent events from the fleet.
- Improved handling of temporary system degradations by maintaining control and automatically recovering without driver intervention, reducing unnecessary disengagements.
- Unified the model between Actually Smart Summon, FSD, and Robotaxi for more capable and reliable behavior.
- Actually Smart Summon max speed is now increased to 8mph (13km/h).
- Help Tesla improve Self-Driving by selecting an intervention reason on the main screen after taking over.
- You can now see distance traveled in FSD (Supervised) without an intervention. The Self-Driving App will also show your longest intervention-free streak.
- Parking options now display on the map when arriving at your destination.
Upcoming Improvements
- Expand reasoning to all behaviors beyond destination handling.
- Add pothole avoidance.
Acronyms used:
- RL = Reinforcement Learning
- MLIR = Multi-Level Intermediate Representation (MLIR)
- FSD = Full Self-Driving
- AI = Artificial Intelligence
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Related Tesla Software Updates News
- Tesla FSD v14.3.12 with Halloween Update (2026.38.5) goes wide release (demo video, release notes)
- Tesla begins the FSD v14.3.11 (2026.33.5) update rollout (first impression videos, release notes)
- Tesla Emergency Drive Away feature can cost $25K in Supercharger damages, coming in the 2026.38.3 update to the US only
- Tesla update 2026.38 improves car visuals and adds auto-leveling headlights for legacy HW3 cars (NHTSA recall, release notes)
- Tesla rolls out FSD v14.2 Lite: legacy Tesla owner reviews, rollout status
- Tesla rolls out FSD v14.3.9 (2026.27.6) with Automatic Collision Evasion: feature details and official release notes
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