The acquisition of OpenRouter, a startup that helps developers select and switch between AI models, follows its $113 million Series B funding round at a reported $1.3 billion valuation just months ago. OpenRouter, founded in 2023, provides a single access point to over 400 AI models, serving 8 million developers. This move positions Stripe, a payments processing firm, to enter the AI infrastructure sector, addressing businesses' growing pressure to manage AI costs.