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Pass-through model router for Claude Code and Codex CLI that picks a model tier per human turn with Jev, TypeSafe AI's decision model
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- 2
- Last pushed
- Updated Oct 2026
Repo stats from the GitHub API, cached Oct 2026.
CommunityJev Agents & MCP
Jev Router — dirien
Local pass-through proxy that asks Jev which tier each human turn needs — fast, balanced, frontier, or max — then forwards Claude Code and Codex CLI traffic to that model while streaming responses back unchanged.
- Stars
- 14
- Language
- JavaScript
- License
- APACHE-2.0
- Published by
- Community
- Author
- dirien
- Last verified
- Oct 2026
This is one of several Jev listings for the same project. The canonical entry is Jev Router — gargpratyush.
About this project
A local model router for Claude Code and the Codex CLI that picks a model tier for each human turn with Jev. jev-router is a pass-through proxy that runs on your own Mac or Linux machine. Claude Code talks to it in Anthropic Messages and Codex in OpenAI Responses. When you write a new message, the router asks Jev, TypeSafe AI's System One decision model, which tier the work needs, and sends the session to a fast, balanced or frontier model.
Quoted from the project's README. Read the full README.
Highlights
- Decides only when a person writes and only moves up within a session, avoiding mid-task downgrades that waste per-model prompt cache.
- Speaks Anthropic Messages to Claude Code and OpenAI Responses to Codex, passing requests through unchanged except model, credential, and incompatible fields.
- Setup installs the background service, stores keys in a user-only file, points Claude Code at the router, and offers doctor, live view, and uninstall commands.
- Needs only Node.js with no runtime dependencies and no Docker; Jev keys come from TypeSafe or OpenRouter while Claude login passes through.
Watch out
Routing Claude Code to non-Claude models through a gateway is unsupported, so default setup stays on Claude unless the Ollama option is picked. Copy reviewed against the repository README on 2026-10-04, not from running it.
Questions about this entry
Short answers drawn from the linked project or page.
That is why it routes only on human turns and only moves up: mid-task switches lose per-model cache and a stronger model recovers only part of the gap when inheriting a weaker transcript.
Almost nothing: model, credential, and fields the target cannot accept are rewritten, while SSE and other responses stream back byte for byte for both Claude Code and Codex.
It saves keys in a user-only env file, installs via npm when run through npx, starts a launchd or systemd user service, backs up and rewrites Claude settings, and doctor, live view, launch, and uninstall manage it.
Claude defaults pair Haiku, Sonnet, and Opus to fast, balanced, and frontier with Fable as opt-in max, while Codex uses Ollama Cloud for fast and balanced and OpenAI models for frontier and trusted tiers.
Open http://127.0.0.1:4100 to see each message you write with the model the router picked and why; jev-router doctor separately lists the config, the keys, the service, and whether the router answers.
Not by default and not through a gateway: Anthropic does not support routing Claude Code to non-Claude models that way, so setup keeps Claude Code on Claude models unless you pick the Ollama Cloud option for the fast tier.
Run jev-router uninstall, which stops the router and removes its changes from Claude Code's settings while keeping your config, keys, and logs, then prints the command that deletes them; add npm uninstall -g @ediri/jev-router to remove the package.
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