Tesla FSD v14.3.8 and 14.1 Lite Arrive in Update 2026.26.6.5

Tesla started pushing update 2026.26.6.5 on August 26, 2026, and it's a big one: it merges the Summer Update with a fresh Full Self-Driving (Supervised) build for North America. The release carries FSD (Supervised) v14.3.8 alongside FSD (Supervised) v14.1 Lite, and the detailed release notes cover HW4 vehicles across the lineup — Model S, Model 3, Model X, Model Y, and Cybertruck.

Rollout is still early. TeslaFi data cited by NotaTeslaApp shows 1,196 cars on the build, or about 9.5% of the tracked fleet, with 660 installs the previous day and 114 more the day of publication. In other words: if your car hasn't pinged you yet, be patient.

What's new in FSD v14.3.8

Most of the changes are under the hood, but a few should be immediately noticeable from the driver's seat:

  • Upgraded reinforcement learning stage in the neural network training pipeline, which Tesla says improves behavior across a wide variety of driving scenarios.
  • New vision encoder for better understanding in rare and low-visibility situations, stronger 3D geometry understanding, and expanded traffic sign recognition.
  • AI compiler and runtime rewritten from scratch with MLIR, delivering a claimed 20% faster reaction time and quicker model iteration for Tesla's engineers.
  • Less lane biasing and minor tailgating — two of the most common complaints from FSD drivers.
  • More decisive parking, with faster spot selection, better maneuvering, and an improved parking location pin now displayed on the map with a P icon.
  • Better response to emergency vehicles, school buses, and right-of-way violators, plus other rare vehicle types.
  • Improved handling of small animals, with RL training focused on harder examples and rewards tuned for proactive safety.
  • Smarter traffic light handling at complex intersections — compound lights, curved roads, and yellow-light stopping.
  • Better handling of odd objects that extend, hang, or lean into the vehicle's path.
  • Graceful recovery from temporary system degradations, maintaining control and recovering automatically to reduce unnecessary disengagements.

Driver monitoring gets more precise

One line in the notes deserves its own callout for anyone who drives with FSD daily:

Improved driver monitoring system sensitivity with better eye gaze tracking, eye wear handling, and higher accuracy in variable lighting conditions.

Better eyewear handling is genuinely good news if you wear prescription glasses or sunglasses on a bright commute — the cabin camera has historically been fussier in those conditions. To be clear, this is a supervised system: Tesla still requires you and anyone you authorize to pay attention to the road and be ready to take over at any time. Nothing in this update changes that, and no accessory should be used to work around it.

Summon, stats, and the unified model

Tesla has now unified the driving model behind Actually Smart Summon, FSD, and Robotaxi for more consistent behavior — a change introduced in v14.3.2 for most vehicles and v14.3.4 for Cybertruck. Actually Smart Summon's max speed also sits at 8 mph (13 km/h) as of v14.3.3, though that speed bump isn't available on Cybertruck.

Also carried forward: the ability to select an intervention reason on the main screen after taking over, plus distance-traveled-without-intervention tracking and a longest intervention-free streak in the Self-Driving App. Parking options appear on the map as you arrive at your destination.

Tesla lists two items as upcoming improvements: expanding reasoning to all behaviors beyond destination handling, and adding pothole avoidance.

The Summer Update rides along

Because 2026.26.6.5 folds in the Summer Update, there's a long list of non-FSD additions too — Start Self-Driving from Park, Arrival Options, Speed Profiles, Estimated Range, Preferred Routes, Automatic Navigation, Traction Control Modes, Speed Cameras on Route, Custom Wraps, Camera Preview, Set Arrival Energy, Apple Music, the revamped Web Browser with bookmark sync, Supercharger Search, a new Welcome Animation, Rear Display updates, Caraoke with scoring, Grok Commands and "Hey Grok," and security improvements. NotaTeslaApp also logged eight undocumented changes, including browser zoom, a visualization zoom shortcut, improved lighting in the driving visualization, and rear spoiler visualization.

What this means for your setup

Updates this large are a good moment to look at how your cabin is actually set up. A few practical notes:

  • Keep the cabin camera's view clear. With driver monitoring getting more sensitive, anything obstructing the interior camera — a poorly placed mount, a dangling accessory, an aftermarket mirror — works against you.
  • Screen protectors matter more now. More of this update lives on the center display: parking pins, arrival options, self-driving stats, the browser. Glare and fingerprints are a real usability issue on a screen you're glancing at while supervising.
  • Summon means parking lot use. At 8 mph, Actually Smart Summon is more useful for retrieving the car — a phone grip or magnetic mount makes holding the app steady far less awkward.
  • Roadside gear is still your job. No software update replaces a jump pack, tire inflator, or reflective triangle in the frunk.

Software updates roll out in waves, so check Controls → Software and make sure your car is on Wi-Fi. Source: NotaTeslaApp release notes for 2026.26.6.5, published August 26, 2026.

Back to blog