Jev Router Playground

It is an interactive model-routing experiment: build a pool of OpenRouter models with routing descriptions, give Jev a task, and see which model it selects with calibrated probabilities. Then check the decision against the answer you actually judge best and learn where Jev's routing succeeds or fails.

There is no build step. Serve the folder over plain HTTP with python3 -m http.server 8000 or npx --yes serve . -l 8000, then open the printed address. Opening index.html directly with file:// works in most browsers, but the README recommends HTTP because some APIs require an http or https origin.

Both the TypeSafe/Jev key and the OpenRouter key are pasted in Settings and live in sessionStorage for the current tab only. The OpenRouter key is sent directly to OpenRouter; with the default configuration the Jev key passes through the included Cloudflare CORS proxy, and you can self-host the proxy or point Settings at the TypeSafe endpoint directly.

Jev's systemone endpoint accepts one noul question per candidate model: the request carries the task and the candidate profiles, and each candidate gets instructions asking for the probability from 0 to 1 that it is the best fit. The chosen model is the highest probability, and the full distribution is shown as bars.

Yes, if you ask it to. After Jev picks, the playground can run the models through OpenRouter and show each answer with timing and approximate cost, so you can pick the answer you prefer and compare it with Jev's choice; the footer reports match or mismatch.

Each run produces an exportable record as JSON. Across many tasks you can measure how often Jev's routing agrees with the answer you judge best, where its decisions succeed or fail, and whether running only its choice preserves enough answer quality.

It is an MIT-licensed JavaScript project by hugo-alves, with a live demo at kvhx37ziab90c.space.minimax.io linked from the README. The README documents why the CORS proxy exists: TypeSafe's API does not return CORS headers on 4xx responses, which breaks direct browser calls.