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.