Independent and unofficial
Jev is TypeSafe AI's System One model: you send it state and typed questions, and it returns choices, scores, and probabilities instead of text. MrJev collects the guides, prices, and 619 community projects you need to build with it.
How a model that returns typed decisions instead of text works, and where it falls short.
Get early access, install the SDK, and make your first Choice, Score, and Noul call.
Try the three question types in your browser, with your own key and no server in between.
Compare what your decision volume costs on Jev versus Claude and GPT models.
Five popular Jev projects, installed and tested, with what each sends where.
NandhaKishorM/laya
Non-autoregressive decision engine over 100+ languages: three checkpoints and a router that detects the script and dispatches per request. Its benchmarks end with a limits section naming the datasets it does not generalise to and the headline figure that came from a training split.
browser-use/jev-ultrafast
Fast browser agent from Browser Use. Jev decides each step and which element to act on; a small model is called only when text needs to be typed. The authors report a full Google Flights search in about 7.1 seconds.
jaredpalmer/kev
Jev-style decision models from 0.5B to 8B, built as LoRA adapters on Qwen and served behind a Jev-compatible /v1/systemone API.
vercel-labs/agent-desktop
macOS desktop automation over accessibility trees. Since v0.9.2, its jev-desktop scripts let Jev choose which control to operate and which action to take.
jev-chat/jev-chat-jarvis
Android chat assistant that reads the conversation on screen through the accessibility service, has Jev judge the other person's intent and the risk, and fills in a drafted reply that you send yourself. Chinese and English editions.
tamaratran/fast-jev-compaction
Claude Code plugin that replaces the compaction summary with Jev decisions. Every tool call and result is scored; stale ones are dropped or truncated, and everything kept stays verbatim.
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