TypeSafe AI Releases Jev, a Decision-Only Model Returning Typed Probabilities Instead of Text

San Francisco lab TypeSafe AI, founded by former OpenAI researcher Diogo Almeida, has released Jev, the first of its System One Models. Jev does not generate text; it returns typed probabilistic decisions (Choice, Score, Noul) with a probability distribution and confidence value. Input costs $0.042 per million tokens, output is free, the context window is 32,000 tokens, and latency is quoted at 70–500ms.

• Jev returns typed Choice, Score and Noul answers with probability and confidence
• Input costs $0.042 per million tokens, output is free, context window is 32,000 tokens
• Latency is 70–500ms; on Vercel it reached nearly 13% of paid teams in 24 hours
• Developers warn it cannot emit an invalid type but can still return a wrong valid value