TypeSafe AI, the startup behind the Jev model, said it raised about $870 million in a Series A led by Andreessen Horowitz, with Sequoia Capital and existing investor DCVC participating, at a roughly $7.5 billion valuation; Martin Casado is joining the board. The company describes Jev, which went viral after its September 15 release, as built on a transformer architecture but not a large language model: instead of producing text it outputs probabilities, which TypeSafe AI calls “calibrated decisions,” and the company claims it runs faster and uses far fewer tokens than LLMs. TypeSafe AI also says about a third of Fortune 500 companies are already using Jev, a figure it has not detailed or independently verified.