ChatGPT Co-Creator Launches Jev for Software Decisions

Former OpenAI researcher Diogo Almeida, whose instruction-following work contributed to InstructGPT and ChatGPT, co-founded San Francisco-based TypeSafe AI with Erik Gafni and Sasha Sheng. The startup argues that language models optimized for conversation are ill-suited to dependable background automation because free-form output can vary or break software contracts. Its first “System One Model,” Jev, drops text generation in favor of typed probabilistic decisions and calibrated confidence scores that applications can use for classification, routing, scoring and branching.

TypeSafe opened Jev to early access on Sept. 14, 2026, and emerged from stealth a day later with $40 million in seed funding led by DCVC. The company says Jev responds in 70 to 500 milliseconds, making it 40 to 200 times faster on comparable System One tasks. Pricing is $0.042 per million input tokens, or $42 per billion, while output tokens are free. TypeSafe guarantees schema-compliant outputs, though early access remains waitlisted and broader real-world performance has yet to be independently established.