Baseten just raised $1.5B because your AI vendor lock-in is dead

Baseten just closed a $1.5B Series F at $13B valuation.

Fourth fundraise in 18 months.

Revenue grew 20x year-over-year. Inference volume grew 40x. They now process 1 billion inference calls per day across 87 clusters and 18 clouds.

The thesis is simple and it should scare every AI vendor selling closed APIs: open-weight models are now strong enough to replace proprietary ones.

Baseten's customers are running tasks at 30% the cost of OpenAI or Anthropic. And they are not alone. The fastest-growing AI companies are building multi-model strategies, mixing frontier models with custom post-trained ones optimized for specific workflows.

Your single-vendor AI strategy is now a cost problem.

Satya Nadella said it last week: durable advantage comes from learning systems built around your own data, not from renting someone else's model. Baseten is building the infrastructure layer that makes that possible.

Audit your AI spend today. If more than 50% of your inference budget goes to one closed-source provider, you are overpaying for a capability that open-weight models can now deliver. The companies that figure this out first will have a structural cost advantage for the next decade.