Tesla FSD v14.3.4 Detected: What Owners Need to Know

Tesla didn't mention this in their release notes, but we found it: Teslascope has detected a new FSD (Supervised) version — v14.3.4 — appearing in the wild as of June 11, 2026. There are no official release notes from Tesla yet, which means this is an undocumented iteration quietly pushed to at least some vehicles. Here's what the detection tells us and what to expect based on the v14.3 series trajectory.

What Was Detected

Teslascope — the automated Tesla software tracker — flagged two new feature strings simultaneously: FSD (Supervised) v14.3.4 and a companion Full Self-Driving (Supervised) feature entry. These detections typically indicate that a build has been pushed to at least one vehicle in the tracking network, even if it hasn't reached most owners yet.

Tesla has not published a changelog for v14.3.4. Given the minor version bump from v14.3.3, this is most likely a targeted refinement or bug fix build rather than a feature-heavy release — though that can't be confirmed until more owners receive it and report back.

Evidence

This detection is classified as strong undocumented evidence: Teslascope's automated system flagged the version string directly from vehicle telemetry, not from a rumor or social post. The dual detection — both the version number and the feature name — corroborates that the build is real and actively deployed to at least part of the fleet.

Context: Where v14.3 Has Been

To understand what v14.3.4 is likely building on, it helps to know what the v14.3 series has already delivered. According to verified reports, the v14.3 line introduced some of the most substantial FSD architecture changes in recent memory:

• 20% faster reaction time — Tesla rewrote its AI compiler and runtime using Multi-Level Intermediate Representation (MLIR), a significant under-the-hood change that accelerated the entire system's response speed.
• Upgraded neural network vision encoder — Improved handling of rare and low-visibility scenarios, better 3D geometry understanding, and expanded traffic sign recognition.
• Reinforcement Learning improvements — The RL training stage was upgraded, resulting in more natural driving behavior across a wider range of scenarios.
• Behavioral refinements — Reduced unnecessary lane biasing, less minor tailgating, and better responses to emergency vehicles, school buses, right-of-way violators, and small animals.

v14.3.3 — the previous detected version — was rolling out to early access testers and a broader North American fleet on builds 2026.14.6.6 and 2026.14.6.7 in late May and early June 2026. v14.3.4 appears to be the next step in that same rollout cadence.

How to Check If You Have It

1. On your touchscreen, tap Controls → Software.
2. Look for a pending update notification. If one is available, you'll see a yellow clock icon in the top bar.
3. To check your current FSD version specifically, go to Controls → Autopilot — the active FSD version is listed there on supported hardware.
4. If no update is showing, make sure your car is connected to Wi-Fi and parked. Tesla typically pushes updates overnight.
5. You can also check Teslascope's tracker directly for the latest rollout percentage data as it becomes available.

For a full history of recent software changes, see our all software updates coverage.

Details on v14.3.4 are still developing. As owners report back and Teslascope publishes rollout data, we'll update this article with confirmed changes. If you've already received this build, check your FSD behavior on highway merges and urban intersections — those have been the focus areas of recent v14.3 iterations.

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Sources verified at publish time. Spotted an inaccuracy? Email editorial@basenor.com.