Tesla released Full Self-Driving (Supervised) v14.3.10 on 19 September 2026 inside firmware 2026.27.10, a Hardware 4 build for North America covering Model S, Model 3, Model X, Model Y and Cybertruck. Two days on it sits at 0.5% of the tracked fleet, with 36 cars taking it on the day of writing.
The FSD release notes run to seventeen bullets. Not one of them is new.
The notes are not similar to v14.3.9. They are identical.
Read against v14.3.9, which shipped thirteen days earlier on 6 September, the FSD section of v14.3.10 is a verbatim reprint — the same seventeen bullets, in the same order, in the same words. The reinforcement-learning training stage, the vision encoder, the MLIR compiler rewrite and its "20% faster reaction time", the unified model across Actually Smart Summon, FSD and Robotaxi, the 8 mph Summon speed limit, the intervention-reason prompt, the parking pin with its P icon — all of it was already in the previous build's notes.
That includes the bullets v14.3.9 had itself carried over from v14.3.8. The compiler rewrite and the 20% figure have now been printed as new three builds running.
This is a habit rather than an accident. The same thing happened at v14.3.7, whose notes were identical to v14.3.6's. A reader who judges a Tesla FSD release by the length of its release notes will be wrong most of the time.
What is genuinely new in the build
One thing, and it is not an FSD feature. Firmware 2026.27.10 carries Vehicle-to-Home with Powerwall: a Cybertruck can now share its pack with a Powerwall to extend home backup, set up under Charging › Powershare. The car has to be parked, plugged into a compatible Wall Connector, and held above a discharge limit the owner sets. TeslAnt covered the feature and what it corrected about the Powershare hardware requirements when it began shipping.
Automatic Collision Evasion also appears as its own heading, but that arrived with v14.3.9 and is carried forward here too.
So the honest summary of v14.3.10 is that it is a fix-and-tuning build. That is the pattern the v14.3.9 write-up flagged as worth watching for — a follow-up release inside a fortnight — and thirteen days is what it turned out to be.
Where Europe and Oceania stand
The 14.3 branch is not one rollout. It is three, on different versions and different continents.
| Firmware | FSD version | Region | Released | Fleet |
|---|---|---|---|---|
| 2026.27.10 | 14.3.10 | North America | 19 Sep 2026 | 0.5% |
| 2026.28.5 | 14.3.9 | Australia, New Zealand | 16 Sep 2026 | — |
| 2026.27.300 | 14.2.2.6 | Europe | 15 Sep 2026 | 1.5% |
Two of those are worth spelling out. Australia and New Zealand picked up v14.3.9 in 2026.28.5, with region-specific cautions about potholes and speed bumps in the notes — this is a newer FSD version reaching cars that have already run FSD for a year down under, not FSD arriving there.
Europe is the outlier. Its current branch is 2026.27.300, a fixes release carrying FSD 14.2.2.6 — still more than a point release behind North America, and the successor to the 2026.27.200 build that shipped the EU recall remedy. At 1.5% of the fleet it is, for now, more widely installed than the newer North American build.
A European owner reading v14.3.10's notes is reading about a version their car will not see for some time.