The awkward corporate reality of the AI boom: Meta, which has spent billions building its own models, is also one of Microsoft’s biggest AI customers. Bloomberg reports the company pays hundreds of millions of dollars annually to access AI models through Azure, burning through trillions of tokens every week.
What’s Meta doing with all that compute? Benchmarking. Its engineers pull OpenAI models through Microsoft’s Foundry marketplace to test how Meta’s own models stack up. It’s a strange arrangement — renting your competitor’s brain to grade your own — but it makes sense when you consider how much of the AI race comes down to credible performance claims.
The pattern should look familiar to anyone who followed the search wars. Meta once leaned on Bing to power search across its platforms, then quietly built its own technology and cut Microsoft loose. Now Meta is developing an API service that could compete directly with Foundry. Microsoft is essentially helping fund the development of a future rival.
Microsoft’s AI revenue is heavily concentrated. OpenAI alone accounts for roughly 70 percent of it, mostly through massive compute purchases on Azure. Foundry, the marketplace Meta uses, generates only a slice of the business — though its other top customers include ByteDance, Adobe, Perplexity, and Sierra. For Microsoft, the Meta deal is meaningful but not transformative. For Meta, it’s the cost of staying honest about where its models actually stand.
