Musk told Tesla staff to move off Claude and onto his own company's Grok 4.5, then admitted in the same memo that Grok isn't as good.
Elon Musk sent Tesla employees a memo on Friday telling them to switch from Anthropic's Claude to Grok 4.5, the model built by SpaceXAI, and he didn't pretend it was the better tool. According to a report from The Information, later detailed by Electrek, Musk wrote that "Fable is definitely better than Grok 4.5, but most tasks don't require Fable-level capability." Fable 5 is Anthropic's flagship model. Musk runs the company that makes the alternative he's pushing instead.
The memo didn't arrive in isolation. Tesla imposed a $200 weekly cap on what employees can spend on third-party AI tools starting July 6, according to an internal memo first reported by The Information and detailed by Electrek. Three names take the hit: Anthropic, OpenAI and Google. Grok and Composer, xAI's other beta products, are waved straight through, untouched by any of it. Want to spend more? Ask your manager.
You don't need an MBA to see what that combination does. Cap the tools your engineers actually prefer. Exempt the one you own. The switch happens whether or not anyone thinks Grok is the better product.
A Pattern That Keeps Repeating #
The timing fits a pattern that's been building all year. Salesforce has kept much of its own workforce on Anthropic's Claude even while it sells a competing enterprise AI product. Anthropic has spent recent months managing usage-limit resets and outages that frustrated its developer base. Enterprise loyalty to a foundation model, it turns out, survives outages and internal contradictions a lot better than it survives a manager capping the expense account.
Engineers do have a preference, and it isn't Grok. Four people familiar with internal usage patterns told Electrek that Tesla staff largely favor Claude over Grok for day-to-day development work, a preference that held even after xAI product leads ran personal onboarding sessions and Musk sent a company-wide email pushing Composer, xAI's coding tool. Tesla has also put $2 billion into xAI, so the spending cap doesn't just save money. It protects an investment.
Cheaper, Not Necessarily Better #
Grok 4.5 launched publicly on July 9, a day after Musk posted on X calling it "an Opus-class model, but faster, more token-efficient and lower cost." SpaceXAI built it jointly with Cursor, the coding startup SpaceX is acquiring in a deal that values Cursor at $60 billion, and trained it in part on data drawn from how real developers work inside Cursor's codebases.
The pricing backs up half of Musk's pitch. Grok 4.5 runs at $2 per million input tokens and $6 per million output tokens, against $5 and $25 for Claude Opus 4.8. Musk's own comparison put a real task at roughly 13 cents on Grok 4.5 versus $1.57 on Claude Fable 5, a gap he ties to Grok needing 4.2 times fewer tokens to finish the same work.
The performance case is thinner. On an aggregate multi-domain leaderboard, Grok 4.5 lands ninth overall with a score of 76.3, behind multiple models from OpenAI, Anthropic and Google. Its coding score of 68.6 is the lowest of any model on the board. That's an awkward number for a model built with a coding startup and marketed on its coding chops.
None of that seems to be the point. Musk isn't arguing Grok 4.5 wins on merit. He's betting that a large enough price gap makes merit beside the point for most of what an engineer does in a day, and he's using Tesla's own expense policy to force the test.
Whether that bet holds says less about Grok than it does about how much pricing power matters once a company controls both the vendor and the customer. Tesla's engineers didn't choose Claude by accident. They chose it while xAI was actively selling them on the alternative. Now the choice has been made for them.
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