Musk open-sourced Grok Build to fight Anthropic. Anthropic pays him $1.25 billion a month.

The New Stack · 8 hours ago

SpaceX AI open-sourced Grok Build, a terminal coding agent, to compete with Anthropic's Claude Code while Anthropic simultaneously pays SpaceX AI $1.25 billion monthly for computing power. Grok Build scored approximately 70% on the SWE-bench coding benchmark and uses Grok 4.5, positioned as one of the cheapest models at its performance level. The move creates an unusual dynamic where SpaceX AI benefits from the broader coding-agent market expansion regardless of whether developers choose competing products, while simultaneously dealing with internal organizational problems including all eleven xAI co-founders departing and privacy issues that emerged during the open-source release.