Tesla Rewrites AI Compiler, Improves FSD Reaction
Tesla began rolling out Full Self-Driving (Supervised) v14.3 to HW4 vehicles on April 7, 2026, as software build 2026.2.9.6. The release rewrites the AI compiler and runtime on MLIR, claiming a 20% faster reaction time, and adds parking map pins, improved RL-trained vision, better emergency-vehicle handling, and fewer disengagements. Chris Lattner publicly acknowledged the MLIR adoption.
Scoring Rationale
High score due to an official MLIR-based compiler rewrite and a concrete 20% latency claim endorsed by Chris Lattner, which materially improves FSD responsiveness and model iteration. Score reduced slightly for lack of independent benchmarking and the update's limitation to HW4 supervised deployments.
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Sources
- Read OriginalTesla FSD v14.3 rolls out with MLIR rewrite, 20% faster reactionselectrek.co
