Stripe has agreed to buy OpenRouter, the startup whose software helps companies route their spending across hundreds of AI models. The payments firm confirmed the deal on Wednesday, making official an acquisition the pressfirst reportedearlier this month. Axios , citing its own sources, put the price higher, at more than $8 billion, mostly in stock. Its backers include Andreessen Horowitz, Sequoia Capital, Nvidia and CapitalG, one of Alphabet’s venture arms. If the New York Times figure is right, they are cashing out at several times that valuation.