Tesla to upgrade older Model S and X with FSD v14 Lite

Tesla's Head of AI, Ashok Elluswamy, expects the Full Self-Driving v14 Lite software to be released soon for older Hardware 3 Model S and Model X vehicles. The update will bring the current supervised driving stack to Tesla's recently discontinued flagship models.

Elluswamy made the comment to reporter Ryan McCaffrey at Tesla's Cybercab launch event on September 7, 2026. He stated he thought the software build for the S and X "was supposed to go out last week," indicating a release is imminent. These are not the current Hardware 4-equipped models, but the pre-refresh versions built with the older Autopilot computer.

The Long Wait for Flagships

Model 3 and Model Y vehicles with the same Hardware 3 computer began receiving v14 Lite in late June 2026, with a wider North American expansion in July and an early launch in South Korea. The Model S and Model X versions never joined that initial wave, leaving their owners waiting. Tesla describes v14 Lite as a distilled version of the full v14 AI model, compressed to roughly 15 percent of its original size to run on the older hardware's memory and bandwidth limits. The company has been clear that this hardware cannot support unsupervised Full Self-Driving or robotaxi operation.

New Features for Older Cars

The feature list included in v14 Lite is what has made the delay frustrating for owners. The official release notes for the first Lite build added several new capabilities.

A follow-on build in mid-July added more of the Hardware 4 user interface, including a standalone Self-Driving app and the ability to start a trip from Park without pressing the brake pedal. Elluswamy called that version the one "likely going to wide release."

Validation and Performance

That wide release has already reached most other Hardware 3 cars in the United States and Canada. For the S and X, the remaining work appears to be model-specific validation rather than developing new software. There is no official Tesla changelog or build number for the two models yet, only Elluswamy's offhand timeline. Some Hardware 3 drivers who already have Lite on other models report large gains over the previous v12.6 software, while others have described new indecision or phantom braking. The next test will be whether the same software performs cleanly on the older flagship vehicles that have waited the longest for the upgrade.

International rollout timing for all models still depends on regional validation and regulatory approval.