FSD v14.3.9 shows snappier decision-making in early drives

Early testers are reporting noticeably improved decision-making behavior in Tesla's latest Full Self-Driving build. According to one driver's initial observations after a few drives in FSD v14.3.9, "something immediately noticeable with this build is snappier and more assertive decision making behavior in hurry mode with lane changes and creeping. It's not hesitant."

The characterization suggests the system is responding more decisively to driving scenarios that previously may have involved hesitation or overly cautious behavior. Hurry mode typically adjusts FSD's driving style to be more efficient, though specifics on what changed in this version remain limited to early user feedback.

Tesla rolled out FSD v14.3.9 and software version 2026.27.6 recently, with the company highlighting collision evasion improvements in that release. Full details on all changes in v14.3.9 have not been widely documented, so broader performance improvements beyond the reported decision-making changes are not yet known.