What changes inside my CLI when routing is on?

Only the model field, plus its reasoning effort: tools, keybindings, permission prompts, /compact, /resume, and session handling are still the real CLI's, because jev-router runs the real CLI behind a loopback proxy.

Do I need a Claude or OpenAI API key?

No: each launcher reuses the login the real CLI already has, so a Claude Pro or Max, ChatGPT, or SuperGrok subscription works as-is; without a Jev key you simply get the plain CLI.

What leaves my machine when I use it?

Two things: the text of each new user turn goes to Jev to be classified, and the request goes to the supplier it was always going to. Your supplier token is forwarded verbatim and never read, stored, or logged.

How do I override a routing decision?

Name a tier or model in the prompt, such as 'use opus:' or 'run this on the fast tier', and Jev is skipped; /model inside the CLI stands routing down for that conversation, and a command-line --model disables routing entirely.

How can I see which model actually served a turn?

JEV_DEBUG=1 logs the decisions and the model the API says it served; in Claude Code a status line shows the routed model and Jev's confidence, while the CLI's own UI shows only the model it asked for.

What are the routing guardrails?

An explicit choice in your message wins outright; a Jev failure or unrecognized answer keeps the current model; a low-confidence answer never downgrades and caps upgrades at Sonnet; and a downgrade is refused once the conversation is large.

How do I change what a tier means?

Every model and effort is overridable per supplier with environment variables like JEV_CLAUDE_STRONG_MODEL, JEV_GROK_FAST_EFFORT, and JEV_DISABLE_TIERS; tier stems are FAST, BALANCED, STRONG, and LONG, and ~/.jev-router.env makes them permanent.

CommunityJev Agents & MCP

Jev Router — flaviusapop

Launchers for Claude Code, Codex, Grok CLI, and opencode that ask Jev which model-and-effort tier each human turn needs, rewriting only the model field while the real CLI runs unchanged.

See highlights

Open github.com

Stars: 7
Language: JavaScript
License: MIT
Published by: Community
Author: flaviusapop
Last verified: Oct 2026

flaviusapop/jev-router

User repository on GitHub

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Routes each turn in Claude Code, Codex, Grok and opencode to the cheapest model and reasoning depth that can finish it, using TypeSafe Jev

Forks: 1
Last pushed: Updated Sep 2026

Repo stats from the GitHub API, cached Oct 2026.

This is one of several Jev listings for the same project. The canonical entry is Jev Router — gargpratyush.

Tagscommunity javascript routing cli cost

Works forJev for Routing Jev for Classification

Used inJev for Software & DevTools

Languages: JavaScript
Platforms: CLI
Capabilities: Open sourceRequires API key

Highlights

One Jev call per human turn selects a tier as a (model, reasoning effort) pair; only the model field is rewritten.
Launchers reuse the CLI's existing login, so a Claude Pro, ChatGPT, or SuperGrok subscription works and no supplier key is needed.
The proxy binds to 127.0.0.1 only; your token is forwarded verbatim and never read, stored, or logged.
Guardrails: explicit model choices win, Jev failures keep the current model, and low-confidence answers never downgrade.
A Claude Code status line shows the routed model with Jev's confidence; JEV_DEBUG=1 logs the decisions.

Watch out

MIT, begun as a fork of gargpratyush/jev-router and now developing independently, as its NOTICE says. Two things leave the machine by design, the turn text to Jev and the request to its supplier, and JEV_DUMP writes whole request bodies containing prompts and code.

Questions about this entry

Short answers drawn from the linked project or page.

Reactions & coverage

Posts, threads, and videos about this entry from around the web.

X: Hard-coded rules moved to Jev

YouTube: Joe Maddalone tries Jev as a routing and filtering step, with a transcript-analyzer demo.

Facebook: Intake Router keeps diagnosis out of the answer space at the front desk.

FacebookClinicnotes

YouTube: Jev explained for routing and judging, with a comparison against LLMs.

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Glossary definitions related to this entry.

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