Grok 4.5: SpaceXAI's Leap Forward in AI with Cursor

Grok 4.5 shipped on Wednesday, and the most interesting thing about it is not the speed. It's that the model was built with an AI coding tool — Cursor, the same IDE-shaped assistant you'd use to write a React component on a Tuesday afternoon. SpaceXAI (formerly xAI) used Cursor to build a frontier model. That is the actual story.

The second most interesting thing is the comparison the company is making. Elon Musk says Grok 4.5 matches Anthropic's Claude Opus 4.7 and is "much faster" doing it. "The combination of capability, higher speed, and lower cost is what makes it competitive," he said, in the announcement covered by The Hans India.

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This is an excerpt. Read the full post at otf-kit.dev/blog/grok-4-5-spacexai-cursor — full-stack kits your AI coding agent can actually ship to production. Browse the kits →