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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchTesla adapted FSD 12.5 for its older HW3 computer by adding compiler kernels that emulate operations supported natively on AI4 hardware, then validating the HW3 software separately. The build reported for HW3 was FSD 12.5.1.4 in software update 2024.26.15, released on August 21, 2024. Tesla did not publish a detailed account of the kernels or the validation tests.
What HW3 owners received in 2024.26.15
The relevant version was FSD 12.5.1.4 on HW3. At the time, HW4 vehicles were reported to be on FSD 12.5.1.3, a snapshot of two software branches in August 2024—not a rule for later releases. Notebookcheck’s August 22, 2024 report described the HW3 build, and the 2024.26.15 release-notes archive lists the update’s release date as August 21.
The rollout was staged rather than simultaneous. Not a Tesla App reported that the build first reached employee vehicles. Tesla says over-the-air updates are distributed at different times, so an update’s release date does not mean every eligible car receives it that day.
How Tesla adapted the software for HW3
Tesla AI chief Ashok Elluswamy described implementing compiler kernels to emulate operations that AI4 hardware supports natively. In other words, Tesla changed the software path so the newer model could run on HW3; the public explanation does not specify how the kernels were implemented or what hardware resources they consumed.
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“Deploying the larger model requires us to implement a few kernels in the compiler to emulate the same operations that are natively supported on the AI4 hardware.”
Notebookcheck’s account also quoted Elon Musk saying HW3 required “considerable software effort to optimize the code enough to run on HW3” and “needs to be validated separately.” The fragments describe both the engineering work and the need to check the adapted version independently.
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Public accounts do not identify the kernels, provide memory or throughput figures, or describe the validation method. They therefore do not establish whether Tesla used techniques such as quantization, pruning, or distillation, and those should not be treated as explanations for this update.
How the work fits into FSD v12 and 12.5
Tesla’s 2024.26.15 release notes described a wider change to the FSD city-streets stack: a single end-to-end neural network trained on millions of video clips replaced more than 300,000 lines of explicit C++ code. The archive notes that its release-note text was updated after the initial release, so these figures describe Tesla’s account of the stack, not a detailed HW3 implementation specification.
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In its Q3 2024 update, published October 23, 2024, Tesla characterized the 12.5 series as using more data and training compute, a fivefold increase in parameter count, and other architectural choices. Tesla associated those changes with safety and comfort improvements; this is the company’s description, not independent comparative testing of the HW3 build.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the release does—and does not—show about HW3 versus AI4
Getting FSD 12.5 onto HW3 shows that Tesla adapted and separately validated a compatible version for that computer. It does not show that HW3 and AI4 delivered identical performance. The cited sources provide no controlled side-by-side performance test or safety outcome specifically for FSD 12.5.1.4 on HW3.
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Eligibility can also depend on a vehicle’s configuration, hardware, region, model, trim, and model year. Tesla’s support page describes FSD (Supervised) as an advanced driver-assistance feature and says it does not make a vehicle autonomous. Drivers must remain attentive and in control; the feature is not a substitute for supervision. Tesla Support’s Australia page gives that safety language and general eligibility qualifications, but it should not be used to infer U.S. subscription terms or availability.
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