A couple of weeks ago, Ashok Elluswamy, Tesla’s VP of AI, announced that Tesla would finally roll out an FSD update for vehicles with Hardware 3. Earlier this week, on December 30th, Tesla did just that and started a public rollout of FSD V12.6.
Since the initial rollout, the update has gone out in several other waves, but they’ve been extremely small. Thanks to several users, we know have our first look at FSD V12.6 and how it compares to the previous FSD version and to the latest version for Hardware 4 vehicles — FSD V13.2.2.1.
How FSD V12.6 Compares to 12.5.4.2
Vehicles receiving the FSD V12.6 update are coming from Tesla’s Holiday update, version 2024.44.25.2, which includes FSD V12.5.4.2.
While FSD V12.5 was a big step up from FSD V12.3.6 for most users, it did include its share of issues. The big two have been lane selection and behavior at traffic lights.
While the release notes for FSD V12.6 highlight features such as End-to-End on Highway, Improved City Streets Behavior, and Smoother and More Accurate Tracking, FSD V12.6 is noticeably smoother and more capable. It now handles turns and scenarios that it struggled with or simply couldn’t perform on FSD V12.5.
How it Compares to FSD V13
One of the key features of FSD V12.6 is a redesigned controller for smoother and more accurate tracking. This feature actually comes from FSD V13, so users should think of FSD 12.6 as a hybrid between FSD V12 and FSD V13. In fact, it seems like Tesla considered calling this version V13, but more on this later.
The controller referenced in the release notes is responsible for tracking objects around the vehicle. The vehicle can only drive as well as it can see, so the improved tracking accuracy directly improves FSD decision-making, leading to smoother driving. This is very evident in FSD V12.6, which now delivers a level of smoothness comparable to what users are experiencing in FSD V13.
Thanks to Rhys Samson, who has both FSD V12.6 and FSD 13.2, they directly compare the two versions and say that FSD V12.6 now operates as smoothly and confidently as his Cybertruck on FSD V13.2.
In their eyes, FSD 12.6 has done a lot to reduce, if not eliminate, the anxiety of not having AI4/HW4 in their Model S. This may change as AI4 vehicles continue to receive improvements while HW3 vehicles are expected to lag in FSD updates, but FSD V12.6 is a big step forward and could have arguably been called FSD V13.
Which Vehicles are Receiving V12.6
Right now, FSD V12.6 is only rolling out to Model S and Model X vehicles with Hardware 3. So far this has only been “refreshed” models, so it doesn’t include Model S/X cars prior to 2021. When the update was released on December 30th, Ashok Elluswamy stated that the update would be available for “other platforms,” presumably the Model 3 and Model Y, within a week. This puts us at around January 6th for other models. Ashok’s timelines have been extremely accurate and we believe Tesla will deliver this update sometime next week.
The Model 3 and Model Y are expected to be supported, but it’s not clear whether it’ll also include legacy Model S/X vehicles as well.
We expect this release to eventually become available for everyone soon, the only question would be whether it’d become available for legacy S/X vehicles with MCU 1. While the upgrade to MCU 2 isn’t cheap, any owners with an MCU 1 vehicle and HW3 would receive a much more capable vehicle by upgrading to the newer infotainment unit.
What About FSD V13 for HW3?
Rhys Samson
While we expected Tesla to release an FSD update for HW3 vehicles with the new end-to-end highway stack, FSD V13 was more of a wildcard. Would Tesla wait to upgrade HW3 vehicles with newer hardware or spend the time creating a smaller V13 model for HW3 vehicles?
Due to a small bug, it looks like we may have some insight into this question. Users who have installed FSD V12.6 will notice that while the release notes and the vehicle will call update 2024.45.25.10 FSD V12.6, the version shown in the app is actually quite different.
At the bottom of the main screen in the Tesla app, Tesla will show several bits of information, including your vehicle’s software version and the FSD version. While the vehicle software is correctly labeled as 2024.45.25.10, the FSD version actually mentions an unreleased FSD version — v13.2.3.
While this could simply be a bug or a typo, it could also be an indication that Tesla was considering calling this release FSD V13.2.3 and that it may have been a last-minute decision. While this may not mean much, it could be a sign that is already thinking about or developing FSD V13 for HW3 vehicles.
Keep in mind that many features for FSD V13 take advantage of the more powerful hardware, such as larger AI models and improved video feeds. However, other features could potentially be carried over to HW3.
Roll Out
While FSD V12.6 is still only available for the Model S and Model X, it continues to go out in increasingly larger waves. The last wave occurred overnight, and there’s a possibility of us seeing more today. Given the continued waves, it looks like everything is on track for a release to other models this weekend or early next week.
You can keep an eye out on our statistics page to track additional roll outs, and we’ll be sure to cover the release when it becomes available to more vehicles.
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Tesla’s Dan W Priestley attended the Advanced Clean Transportation (ACT) Expo in Anaheim, California, and provided an update on Tesla’s Semi truck program. The presentation covered several key developments on the status of Tesla’s Nevada Semi Factory, refinements to the Semi, and Tesla’s plans for charging and ramping production through 2026.
Let’s dig in and take a look at everything that was captured by the Out of Spec team at ACT Expo. The original video is embedded below if you’d like to watch it.
Semi Factory & Production Ramp
Priestley reaffirmed the timelines mentioned during Tesla’s Q4 2024 Earnings Call that Tesla will scale Semi production in 2026. To achieve this, Tesla has been actively building and expanding the Gigafactory Nevada site, specifically to support the production of the Tesla Semi. The dedicated Semi facility will have a targeted annual capacity of 50,000 Semi trucks.
Following the beginning of production, Tesla will utilize the initial trucks to integrate into its own logistics operations. This will serve as both a final real-world testing ground as well as an opportunity for Tesla to gather data internally. Tesla plans to begin subsequent customer deliveries throughout 2026 as the ramp-up continues.
Reuters also reported that Tesla is hiring over 1,000 new employees at the Semi Factory to begin the rapid ramping of the program.
Semi has already amassed 7.9 million miles with Tesla’s current testing and operational fleets, providing some real-world data and testing. Feedback for the truck has been exceptionally successful, with many drivers praising the Semi’s performance and comfort.
New Tesla Semi Features
Of course, it wouldn’t be a Tesla keynote without showing off some new things. The Semi will be available in 500-mile and 300-mile range configurations, now featuring updated mirror designs and a drop-down glass section to improve visibility and allow easier interaction with external elements—such as control panels at ports, for example.
New Electric Power Take-Off (e-PTO)
The Tesla Semi will also feature a new capability called Electric Power Take-Off, or e-PTO system. Similar to the PTO systems found on other vehicles, this will allow the Semi’s high-voltage battery to power auxiliary equipment at variable voltages. That includes being able to power things like climate-controlled reefer trailers, potentially replacing the noisy and polluting diesel generators traditionally used for this purpose.
Charging and Batteries
Out of Spec BITS/YouTube
Tesla is also working on an updated battery pack design for the final production design of the Semi. This new pack is designed to be more cost-effective to manufacture. The battery pack itself is slightly smaller than before, but the truck maintains the same level of range through efficiencies. Dan also confirmed during his keynote that the battery cells for the Semi will be sourced domestically inside the United States, helping to alleviate potential burdens due to tariffs.
On the charging front, Tesla is using MCS - the Megawatt Charging System - capable of 1.2MW - and designed specifically for Semi. The system uses the same V4 charging hardware found at Supercharger sites but focuses on that larger power output. Alongside a smaller physical footprint, Tesla will be able to configure these V4 cabinets for either dedicated Semi charging or for shared power scenarios with regular Superchargers. Tesla is also working on an integrated overnight charging product, but Tesla isn’t ready to talk about it yet.
46 Semi Charger Sites Coming
The 46 new MCS sites coming soon.
Out of Spec BITS/YouTube
Finally, Tesla has made substantial investments in a public charging network for the Semi. There are currently 46 sites in progress throughout the United States, and plans for significant expansion throughout 2026 and 2027. These sites are strategically located alongside major truck routes and within industrial areas to support long-haul and regional operations. Tesla is aiming to offer the lowest possible energy costs to operators to help incentivize adoption.
This was one of the best updates to the Tesla Semi we’ve received since its initial unveiling. It seems that the Semi will receive a big portion of Tesla’s attention in 2026, while Robotaxi and FSD Unsupervised take the stage this year.
The Tesla Semi has the potential to transform transportation even more dramatically than EVs already have, serving as a testament to Tesla’s mission to electrify the world.
Sentry Mode is an invaluable tool for owners - capable of keeping the vehicle safe and secure even when you’re not around. This is especially true in recent times, with the misguided and unfortunate incidents surrounding Tesla ownership, including damage to Tesla vehicles, showrooms, and Superchargers.
B-pillar Camera Recording and Dashcam Viewer
With the 2025 Spring Update on 2025.14, Tesla is expanding Sentry Mode’s functionality for certain vehicles with some much-needed changes. Sentry Mode and Dashcam can now record footage from the vehicle’s B-pillar cameras. These cameras are located on the side pillars of the vehicle, between the front and rear doors.
This adds two crucially needed viewpoints, making Tesla’s Sentry Mode a truly 360-degree security system. These cameras also provide the best angles for capturing license plates when parked, so they will be greatly appreciated by owners in the event of an incident.
These vehicles are also receiving an improved Dashcam Viewer, which now displays the six camera feeds along the bottom and a new grid view. It also allows users to jump back or forward in the video in 15-second increments.
However, to the disappointment of many owners, not all vehicles are receiving these updates due to the additional processing power needed.
Limited to Hardware 4 Vehicles, Ryzen Isn’t Enough
We have confirmed that Tesla is only adding the additional camera recording and improved Dashcam Viewer on hardware 4 (HW4 / AI4) vehicles. The newer hardware presumably has the additional processing power and bandwidth needed to handle recording and saving the two additional video streams during Sentry Mode and Dashcam.
For the time being, owners of HW3 vehicles are not receiving this feature. This includes all vehicles with HW3, even those with AMD Ryzen infotainment systems. If you’re not sure whether your vehicle has HW3 or HW4, you can refer to our FSD hardware guide.
While there’s no doubt that recording two additional camera streams would be more computationally intensive, we hope that Tesla adds the improved Dashcam Viewer to HW3 vehicles in a future update.
Cybertruck Also Missing Improved Sentry Mode
Surprisingly, and most confusing for many - is the fact that the Cybertruck is also not receiving the improved Dashcam Viewer and B-pillar camera recording with this update. This struck us as odd, especially since the Cybertruck is currently the only vehicle with the improved, more efficient version of Sentry Mode.
Every Cybertruck is equipped with HW4 and AMD Ryzen infotainment units, so this clearly isn’t a hardware restriction. It’s possible the more efficient Sentry Mode is playing a role here due to the infrastructure changes. However, we expect Tesla to address this in a future update and eventually release these features for the Cybertruck as well.
Given the Cybertruck’s high visibility and its status as a frequent target for both positive and negative attention, many owners hoped that the Cybertruck would be one of the vehicles to receive this feature.
Adaptive Headlights
Tesla finally started rolling out its adaptive headlights in North America. While the new Model Y already came with the feature when it was released last month, other vehicles with matrix headlights are now receiving the feature in the Spring Update.
All vehicles with matrix headlights are receiving this feature, which includes the new and old Model 3, first-gen Model Y, and the new Model S and Model X.
If you’re not sure if your vehicle includes matrix headlights, check out our guide. What’s interesting here is that older vehicles that were retrofitted with matrix headlights due to an accident or user replacement are also receiving the adaptive headlights feature.
Legacy Model S & Model X
As with most updates, the older legacy Model S and Model X are not receiving all the features included in this update. Unfortunately, some of the features, which include the Blind Spot Camera on the instrument cluster, Save Trunk Height Based on Location and Keep Accessory Power On are limited to the new Model S and X.
Legacy S and X models will receive the Alternative Trip Plans feature, Avoid Highways (Requires Intel MCU) and the Keyboard Languages feature.
These vehicles are also receiving all the features in the Minor Updates section except for the visualization showing how far the door is opened, which is exclusive to the Cybertruck. These additions include improved music search results, contact photos in the phone app, automatic connecting to hotspots, the ability to show third-party chargers, view Supercharger amenities, and various improvements to music services.
While many users will be disappointed not to receive the B-pillar camera recording and Dashcam Viewer improvements, it’s important to remember that Tesla typically does a great job at bringing features to older vehicles, at least with the Model 3 and Model Y. If a feature isn’t added, it’s usually due to a hardware limitation.
![Tesla Semi Keynote: New Features, 46 Charging Sites, Upgraded Battery & More [VIDEO]](https://www.notateslaapp.com/img/containers/article_images/semi/semi-new-features.jpg/c7df4e0d32f8cb0beee080ad201e943b/semi-new-features.jpg)
