Jev is quickly beocming the primary choice for classification requests on OpenRouter.
It took 27% of weekly request volume in this category, nearly 2x the share of DeepSeek V4 Flash which previously held the top spot
Jev Router keeps a model that works for the rest of the session.
It can raise or lower effort without switching models. It switches only when the expected gain is larger than the cost, including the cached chat it would lose.
Jev reads the conversation text only to pick the model and effort.
It runs under zero data retention (ZDR) terms, so nothing is stored or trained on. Attachments are never sent to Jev, and requests with "zdr: true" work with Jev Router.
Jev Router runs on Jev, TypeSafe's first Decision / System One model.
Before each turn, Jev reads your prompt and scores it on difficulty and precision. Also checks whether a bigger model or more effort would help, whether a cheaper model is enough, and whether the task changed.
Most routers pick a model based on each message. Each switch loses the cached chat, so you pay full price for the new model to reread the whole conversation.
Most routers also route on the task type, not the difficulty. Easy and hard coding tasks get the same model.