Rivian Gen 2 Highway Assist May Have Quietly Dropped Mobileye in Latest Update

Reddit user u/mpshizzle may have uncovered a major under-the-hood change in Rivian’s Gen 2 driver assistance system. While Rivian hasn’t said anything official, their testing points to a shift away from Mobileye hardware and toward Rivian’s own perception stack in the latest 2025.26 update.

Back when Gen 2 launched, Rivian showed off new custom 4K HDR cameras. But earlier testing suggested that Highway Assist actually relied on a single off-the-shelf Mobileye camera in the windshield. Blocking that camera disabled driver assistance completely, while covering Rivian’s cameras didn’t seem to matter. The result was a system where Rivian’s cameras handled the on-screen visualizations, but Mobileye did the actual driving.

After updating to 2025.26, though, things feel different. Highway Assist reacts more naturally to cut-ins and lane changes, even if lane centering sometimes drifts or struggles with dashed lines. That behavior led to another round of the tape test, and this time the results flipped. Blocking Rivian’s cameras shut down driver assistance immediately, while covering the Mobileye unit had no impact at all.

If accurate, that means Rivian just switched its Highway Assist system entirely over to its own cameras and AI. And what makes this even more intriguing is how little Rivian said about it. The 2025.26 release notes only mention small ADAS improvements like “better lane line visibility” and visualization tweaks. Nothing about dropping Mobileye support or re-architecting the system behind the scenes.

So what does this mean for owners? If Rivian really is moving away from Mobileye, it’s a huge step toward full control of its driver assistance tech. The rougher lane keeping could just be the growing pains of training a brand-new system. It also hints that Rivian may soon be ready to expand Highway Assist beyond geo-locked highways, since perception-based driving won’t be tied to pre-mapped roads.