Tesla says its next Full Self-Driving architecture, FSD v15, is being built to run on the same Hardware 4 computer already installed in cars today, and the company is now targeting a launch window of late 2026 into early 2027.
What Tesla has actually confirmed
At a JPMorgan investor event held at Tesla’s Fremont factory, the company described v15 as a “step-change” built on seven core technologies, roughly 40% of which are already running in the Austin robotaxi fleet, according to Electrek’s reporting on the event. Tesla also said it is rolling out an upgraded AI4.5 computer with roughly 10% more compute and double the memory, but maintains that existing HW4/AI4 hardware is sufficient to run v15 itself.
That hardware claim traces back further, to Tesla’s Q1 2026 earnings call, where Elon Musk said v15 is being designed to “squeeze every ounce of performance out of the existing Hardware 4 units” rather than requiring the newer AI5 chip, and put the release at “the end of 2026, or start of 2027,” per Not a Tesla App’s writeup of that call. The version is described as a full architectural overhaul, moving from roughly a 1-billion-parameter driving model to one built around 10 billion parameters.
Why the hardware promise is worth watching
Tesla made a nearly identical sufficiency claim about Hardware 3 before walking it back — HW3 cars ended up with a stripped-down “Lite” build of FSD v14 rather than the full version. Electrek’s report on the JPMorgan event flags that same history as a reason to treat the “HW4 is enough” promise with some caution this time. Nothing about v15 is running in customer cars yet, and unsupervised FSD deployment more broadly is still tied to state-by-state legalization, not just a software update landing on the car.
Dirty Tesla covered Musk’s earlier FSD v15 comments in a video posted July 24, 2026, walking through what an architecture jump like this could mean for how the car drives day to day.
That video reflects one creator’s read on Musk’s remarks, recorded before the JPMorgan event above. The hardware and timeline details in this article come from Tesla’s own earnings call and the reporting linked above, not from the video.
Photo by Leonardo Gonzalez.