$1.25 billion a month buys a real Claude Code contender
I’ve been using Grok Build a lot this week. That’s not a sentence I expected to write, given Musk’s track record of promising big and shipping rough, but the tool is a genuine Claude Code competitor. I wrote a decision guide comparing terminal coding agents before, and now there’s a third entry worth slotting in.
Yesterday Musk open-sourced the whole thing, and while that’s interesting, the number behind it makes the strategy clear: Anthropic pays Musk $1.25 billion a month for Grok infrastructure. That’s not rent-seeking, that’s funding a capable agentic coding tool now free to inspect and extend.
The quality has real evidence beyond my own sessions. tetsuo used Grok 4.5 in Grok Build to create a game engine, then built an ARPG on it—world, combat, loot, progression—with all assets generated via Grok Imagine.
I used Grok 4.5 in Grok Build to create a game engine for agentic coding, then built an ARPG on it, with all game assets generated via Grok Imagine in Grok Build. AI agents can build worlds, combat, loot, progression, maps, tests, and playable games. ⚒️🎮 https://t.co/0tNB7LDXOj
Simon Willison poked through the freshly open-sourced 844,000-line Rust codebase and found details like a “self-contained terminal renderer for Mermaid diagrams” that uses Unicode box-art instead of requiring an image viewer.
I poked around in the just open sourced Grok Build CLI tool - 844,000 lines of Rust code! - and dug up a few interesting highlights, including a "self-contained terminal renderer for Mermaid diagrams" that renders them using Unicode box-art! https://t.co/CQ9yUKz4kq
That’s thoughtful engineering, not a flashy demo. I want to test the game development side myself next—if the agent can generate assets and hook them into working gameplay in one session, it changes what a solo developer can ship in a weekend.