Elon Musk said Grok 4.5, built on a 1.5 trillion-parameter V9 base model and fine-tuned with Cursor data, is now in internal testing at SpaceX and Tesla.

2026-06-28

Elon Musk said Grok 4.5, built on a 1.5 trillion-parameter V9 base model and fine-tuned with Cursor data, is now in internal testing at SpaceX and Tesla.