Harvey AI just raised $500M at $15.5B. It's building its own models to escape OpenAI.

Harvey AI is raising $500 million at a $15.5 billion valuation.

Five months ago it was worth $11 billion.

The driver: $350 million in annualized revenue, nearly double the $190 million it reported in January.

But the real signal isn't the money. It's what Harvey is doing with it.

In June, Harvey announced plans to build custom foundation models optimized for legal tasks. Right now it runs on Anthropic and OpenAI APIs.

Read that again. Harvey's biggest strategic move is to stop depending on the companies building competing legal tools.

OpenAI is developing ChatGPT features for law firms. Anthropic already ships legal capabilities with Claude. Harvey's infrastructure providers are becoming its competitors.

This is the API dependency trap playing out in real time.

Every AI startup relying on a single model provider should be watching. The moment your vendor enters your vertical, your moat is only as deep as your domain data.

Harvey's 44x revenue multiple proves investors will pay up for vertical dominance. But they're betting on Harvey owning its stack, not renting someone else's.

Audit your AI vendor contracts today. If your provider can build a competing product on top of their own infrastructure, you don't have a partnership. You have a countdown.