Tesla began pushing FSD (Supervised) v14.2 Lite to Hardware 3 Model S and Model X on 23 September 2026, in firmware 2026.27.10 and 2026.27.11. It is the first time either car has run any version of the v14 branch. Until now they sat on v12.6, where HW3 cars have been for more than a year.
It also settles a question TeslAnt was left with a fortnight ago. When v14.2 Lite reached HW3 Model 3 and Model Y on 8 September, Model S and X were explicitly excluded, and Tesla had confirmed nothing beyond a remark attributed to its AI lead at the Cybercab launch that the build was expected "last week".
What Lite actually is
Lite is not v14 with fewer settings switched on. It is the Hardware 4 v14 stack distilled to run inside HW3's compute budget — smaller networks trained to imitate the larger ones. The capability list is real, and shorter.
| In v14.2 Lite | Not in Lite |
|---|---|
| Start from Park | Automatic Collision Evasion |
| Parking and unparking at the destination | |
| Shifting between drive and reverse | |
| Reversing | |
| Speed profiles on city streets |
Automatic Collision Evasion is the omission worth naming. It shipped to HW4 cars in v14.3.9 earlier this month and does not cross over.
Which cars, and how few
Only the redesigned Model S and X — the 2021 refresh — have been seen taking it. The legacy pre-2021 cars are still waiting, and NotATeslaApp describes the number of S and X vehicles updated so far as very small. That is Tesla's normal pattern: a narrow release, held until nothing surfaces, then widened.
The firmware is not itself new. 2026.27.10 first appeared on 18 September and is the same build carrying FSD v14.3.10 to HW4 cars. Teslascope tracks 162 cars on it, of which under 1 percent are HW3 at all.
Europe is not in this
Teslascope puts the build at about 92 percent United States and about 7 percent Canada, leaving well under 1 percent everywhere else. The Lite branch has never shipped in Europe in any version, and nothing here changes that.
For European Model S and X owners the exclusion is doubled. The cars Tesla sold here in the final run before production ended were mostly the refreshed shape, but a European HW3 S or X is by definition an older car — and older is precisely the group still waiting even in North America.
Why it is worth noting anyway
The last Model S and X left Fremont in May 2026. Four months on, Tesla is still porting its current autonomy stack onto their oldest computer, for a group of cars measured in the hundreds.
That is the part to file away. Support after discontinuation is usually the first thing to go, and a car whose software has stopped moving loses value faster than one whose software has not. Tesla did the comparable thing this week with the Powerwall 2, a product it also no longer sells. Neither is a promise. Both are evidence.