Tesla FSD v14.3.12 and Software 2026.38.5 Explained: Unified Model, AI4 vs HW3 'v14 Lite', How to Check (Korea Status)
What changed in Tesla FSD (Supervised) v14.3.12 and 2026.38.5, who gets v14.3.12 vs v14.3 Lite, how to check your version, and what we know about Korea.
TL;DR: Tesla software 2026.38.5 (first seen 10 Oct 2026) carries FSD (Supervised) v14.3.12 for cars with AI4 (also called HW4) and v14.3 Lite for eligible HW3 Model 3 and Model Y. The headline change in Tesla's notes is a unified model across Actually Smart Summon, FSD and Robotaxi. It is rolling out in waves, mostly in North America so far, and it is not clear from public sources that 14.3.12 has reached Korea. Here is what changed, who gets what, and how to check your own car.
What the release notes say changed in v14.3.12
These points come from Tesla's release notes as reproduced by Not a Tesla App and Teslascope (we have not tested the software):
- Training: an upgraded reinforcement-learning stage, with gains "in a wide variety of driving scenarios."
- Vision: an upgraded vision encoder for rare and low-visibility scenes, stronger 3D understanding and wider traffic-sign understanding.
- Speed of reaction: the AI compiler and runtime were rewritten with MLIR, which Tesla says gives "20% faster reaction time."
- Behaviour: less unnecessary lane biasing and minor tailgating, more decisive parking-spot choice, better handling of emergency vehicles, school buses, small animals, complex traffic lights and unusual objects in the path.
- Resilience: it can maintain control and recover automatically from temporary system degradation, which Tesla says reduces unnecessary disengagements.
- Driver monitoring: better eye-gaze tracking, eyewear handling and accuracy in varying light.
- Unified model: "Unified the model between Actually Smart Summon, FSD, and Robotaxi for more capable and reliable behavior." Teslascope's version of the notes adds that Summon's top speed rises to 8 mph (13 km/h).
- Owner tools: pick an intervention reason after taking over, see distance driven in FSD without an intervention, and see your longest intervention-free streak in the Self-Driving app. Parking options show on the map on arrival.
- Listed as upcoming, not in this release: reasoning for all behaviours beyond destination handling, and pothole avoidance.
What "unified model" means: Tesla's wording is that one model now serves Summon, FSD and Robotaxi. We read that as a shared foundation, so improvements can carry across products. Tesla hasn't published details, and We Talk Tesla also describes this as a shared foundation and says nothing beyond that. We can't say how it changes your own drives.
Who gets what: AI4 vs HW3
| Your car | What 2026.38.5 carries |
|---|---|
| AI4 / HW4 (Model S, 3, X, Y, Cybertruck, per the release notes) | FSD (Supervised) v14.3.12, plus Automatic Collision Evasion, which is listed for HW4 |
| HW3 Model 3 and Y | FSD (Supervised) v14.3 Lite, the "v14 Lite" build |
What v14.3 Lite is, per Tesla: it "distilled the intelligence from HW4 V14 into HW3," so HW3 can learn from HW4's V14 as a guide. Listed changes include better responsiveness for merges, forks, pedestrians, traffic lights and cut-ins, smoother lane centring, parking, unparking and reversing, Arrival Options (parking lot, street, driveway, pull over), and Speed Profiles at all times, including a new SLOTH profile that is slower than CHILL. Start Self-Driving from Park also appears for HW3 Model 3 and Y.
Be careful with the name. Lite is not the same release as 14.3.12. It is a separate HW3 build that rides in the same software package. Two owners can install 2026.38.5 and see different feature lists, because features depend on processor, model and region (We Talk Tesla, Teslascope).
How the rollout looks so far
- Teslascope lists 2026.38.5 as released on 10 Oct 2026. Its install log, as we read it on 16 Oct, was dominated by the US, with some Canada and a few other countries.
- Teslascope reported on 12 Oct that about 1,430 additional cars were receiving the update in one wave, about 92% AI4 and 8% HW3 (via We Talk Tesla).
- Not a Tesla App's tracker showed 3.4% of the fleet it sees on the update when we looked. These trackers only count cars from opted-in users, so they show direction, not a precise share.
How to check whether you have it
Menu names vary a little by model and version, so follow what your screen shows.
- On the touchscreen, open Controls and find Software. Your current version, such as 2026.38.5, shows there. If an update is available you'll see an install option.
- Connect the car to Wi-Fi and keep it plugged in or well charged, which is Tesla's standard advice for updates.
- Find your computer type. The Software screen's additional vehicle information lists the hardware, which tells you AI4/HW4 or HW3. If you can't find it, check your car's model year and trim in Tesla's support pages.
- After updating, open the Self-Driving settings. On AI4, look at the FSD version number, which should read 14.3.12 if you are on the full build. On HW3 Model 3 or Y, you'd expect "14.3 Lite."
- If you don't see the update, don't force anything. Tesla sends updates in waves, and third-party trackers show the same.
Korea status
- Lite: Tesla's second-quarter update said v14 Lite had begun reaching customers in the US and South Korea (via We Talk Tesla). Korean outlets Segye and Bloter report that supervised FSD v14 Lite has been delivered to US-built HW3 Model 3 and Y in Korea since July 2026.
- 14.3.12 / 2026.38.5 in Korea: We found no source that confirms this exact version is available in Korea yet. Tracker data we saw is mostly North American.
- Eligibility: In Korea, supervised FSD is limited to US-built cars. China-built Model 3 and Y, which are most of Tesla's Korean sales, are not enabled, because of certification rules (Segye, Bloter). The matter is also being discussed in the National Assembly, with a committee audit scheduled for 23 Oct 2026. See our separate timeline on that audit.
- Always check the Software screen on your own car. Korean availability may differ from the notes, which are written for global releases.
Practical cautions
- It's still supervised. Tesla's own text says the car is not autonomous, and you must stay attentive.
- Emergency Drive Away lets you shift into Drive with a Supercharger cable connected. Tesla warns this damages the car and charger and that you may pay for repairs. Don't use it casually.
- Release notes and unofficial trackers may change. We haven't road-tested 14.3.12.
Sources: Not a Tesla App, release notes for 2026.38.5 (FSD 14.3 Lite and 14.3.12); Teslascope pages for 2026.38.5 and FSD v14.3.12 (as read 16 Oct 2026); We Talk Tesla, "Tesla FSD v14.3.12 Hits Wider Rollout With Unified Robotaxi Model" (13 Oct 2026); Segye Ilbo and Bloter for Korea. We did not have access to Tesla's own release-notes page.
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