Some contradictions that I am trying to get to the bottom of. Its not helped by me having not test driven any variant of 2020.40.x so don't have my own reference point. The FSD Beta Release is 2020.40.8.10 - believed to be based upon the Autopilot rewrite ('the rewrite'). Yesterday took 2020.48.8 (not to be confused with FSD beta 2020.40.8.10), up from 2020.40.4 a week or so before. The download seems to be exceptionally quick, so the belief is that 2020.40.8 is a very minor update from 2020.40.4. I'm trying to find at what version 'the rewrite' landed, if it has indeed landed. Why, because reports of phantom braking are still rife. The evidence for the rewrite being in 2020.40.x Oct 8 - EM says that phantom braking should be fixed in this release https://twitter.com/EVHQ2/status/1314287584105779200 On this date, 2020.40.x was already rolling. Either fixed by some targeted solution, or as a consequence of the rewrite? Oct 20 - FSD beta started to roll to select users Oct 21 - Andre Karpathy (Tesla software) in response to being asked how the rewrite was going said that "many months of hard work finally land in production builds!" https://twitter.com/alexhorner2002/status/1318984153031974914 Oct 22 - @verygreen suggested that "recent dev builds that were same nn-wise as current prod builds which leads me to believe this is likely no NN change," in other words, the FSD beta is same as current production (2020.40,8?) except for some additional features and not a completely different code base (the rewrite) imho, you would expect the rewrite to need a different NN. Various - AP is smoother - but this has been the case over many builds The evidence against the rewrite being in 2020.40.x Lots of reports of phantom braking - similar to 2020.36.x which I rated poor on this count Surely there would have been more of a fanfare? Not the step change improvement that I/we were expecting? @verygreen could be wrong on this occasion Could we have had the rewrite before 2020.40? Some early speculation that 2020.36 was it, but soon dispelled.