FSDClarity

Can You Upgrade Tesla HW3 to HW4? Cost and Current Status

4 min readBy the FSDClarity team

On this page

No — as of late 2026 there's no HW3-to-HW4 upgrade you can buy or book. Tesla has said that owners who purchased FSD on HW3 will get a computer upgrade if HW3 can't support unsupervised FSD, but the hardware and timing have shifted, and subscribers aren't promised anything. If FSD matters to you and you're buying now, a HW4 car is the sure thing.

Which hardware do you have?

Check if your Tesla has HW3, HW4, or AI5 and see which FSD features are supported.

Check Hardware →

What Tesla has actually promised

Tesla's commitment has been consistent in one way and shifting in another:

  • Consistent: owners who bought FSD outright on HW3 will be upgraded if unsupervised FSD needs more hardware. Elon Musk said in 2026 that HW3 "simply does not have the capability" for unsupervised FSD.
  • April 2026: Tesla described a free upgrade for those owners involving new cameras, a new computer and significant wiring changes, done at dedicated upgrade centers in major cities. It also talked about trade-in discounts for HW3 owners.
  • Mid-2026: Musk suggested Tesla may skip a direct HW4 retrofit and wait for a next-generation computer, with production around mid-2027.

To keep this page evergreen: the commitment is to purchased-FSD owners, and the exact hardware and date are still open. Check Tesla's latest earnings calls for updates.

What it costs

  • Purchased FSD on HW3: Tesla has described the upgrade as free when it happens.
  • FSD subscribers on HW3: no upgrade promise. You can keep subscribing on HW3 or move to a HW4 car.
  • No FSD: there's no reason to upgrade the computer.

There's no official paid retrofit. Third-party shops can't install HW4 either — it requires Tesla-specific cameras, wiring and software authorization.

Why a retrofit is hard

HW4 isn't just a faster chip:

  • Different cameras with higher resolution and different housings.
  • Different wiring and connectors throughout the car.
  • Different cooling and mounting for the computer.

That's why Tesla has talked about specialized upgrade centers rather than a quick service visit — and why it may prefer to wait for a single next-generation upgrade.

AI5 and what it changes

Tesla's next-generation AI5 computer is expected around 2027, initially prioritized for other projects. If Tesla upgrades HW3 cars to a newer board instead of HW4, it could leapfrog HW4 entirely for those owners. But there's no date, and no customer car has AI5 yet.

Buy a HW4 car instead? The math

If you want FSD long term and you're shopping now:

OptionFSD todayFuture-proofing
HW3 car + subscriptionWorks, trails HW4No upgrade promise
HW3 car with purchased FSDWorks, trails HW4Upgrade promised if needed, timing unclear
HW4 carNewest FSD firstTesla's unsupervised target

A HW3 car with purchased FSD can still be a bargain if you're comfortable waiting. If you want the best FSD now, pay the difference for HW4. Not sure what a car has? Check it with the Hardware Checker and read which Teslas have HW4.

Frequently asked questions

Will Tesla upgrade HW3 to HW4 for free?

Tesla has said it will upgrade owners who purchased FSD if needed for unsupervised FSD. The hardware may be a newer computer rather than HW4, and there's no date.

Can I pay to upgrade my Tesla to HW4?

No. There's no paid HW3-to-HW4 upgrade.

Do FSD subscribers on HW3 get an upgrade?

Tesla's promise covers purchased FSD, not subscriptions.

Is HW3 still worth buying?

Yes, if you don't need the newest FSD — HW3 cars still run FSD (Supervised) and are cheaper.

The bottom line

You can't upgrade HW3 to HW4 today. If you bought FSD on HW3, Tesla has promised an upgrade when it's needed; if you're buying now and FSD matters, choose HW4. Compare the two in Tesla HW3 vs HW4.

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