xAI's next-generation Grok 4.5 is now running inside Tesla and SpaceX — quietly, in private beta, as of today. Elon Musk confirmed the deployment on X, noting that early evaluations put its performance close to, and potentially above, Opus. For Tesla owners, it's the clearest signal yet that the AI powering your car's assistant is about to get a significant upgrade.
Grok 4.5 is built on xAI's V9 foundation model, which carries 1.5 trillion parameters and completed training on May 26, 2026. What makes this version distinct from its predecessor is the addition of Cursor data in supplemental training — Cursor being the AI-powered coding environment widely used by developers. That integration suggests Grok 4.5 has been specifically tuned for technical reasoning and code-related tasks, which would be directly relevant to both SpaceX's engineering workflows and Tesla's software development pipelines.
Musk's post also mentioned that reinforcement learning is continuing to improve the model, and referenced "the Grok Build" — though the tweet appears to have been cut off before completing that thought. A public release is expected in the near future, according to background reporting, though no specific date has been confirmed.
For Tesla owners, the practical question is what this means for in-car AI. Tesla's voice assistant and conversational features have historically lagged behind the pace of xAI's model development. If Grok 4.5 moves from internal beta to production deployment, it would represent a meaningful step forward in how the car understands and responds to natural language. How quickly that transition happens — and whether it arrives via an OTA update or a phased rollout — remains to be seen. Keep an eye on all software updates as this develops.
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Sources & reporting notes
The links below identify the material source records used for this report.
- @elonmusk on X (2026-06-28T10:50:05.000Z) — Direct source
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