Developers who already use Claude Code and have a ChatGPT subscription with Codex access, and who accept the account and local security risks the README describes.

What can you build with Clodex?

Run Claude Code's terminal workflow with a GPT Codex model instead of a Claude model. Point an existing Claude Code install at a local proxy using ANTHROPIC_BASE_URL. Compare Codex models at different effort levels inside the same agent harness. Study how the Anthropic Messages API maps onto a Responses-style protocol. Count tokens offline through the local count_tokens endpoint.

Aotricx /

Clodex

Local proxy that runs ChatGPT Codex models inside the Claude Code terminal tool

21 stars
Go
Updated 16 days ago
Some experience
Coding agents & dev tools

Open on GitHub (opens in a new tab)

Claude Code expects to talk to Anthropic's API. Clodex sits on your machine and pretends to be that API. It rewrites each request into the format the ChatGPT Codex backend uses and sends it with your ChatGPT login.

When the backend replies, Clodex converts text, tool calls, reasoning, token counts and errors back into Anthropic's format. One shared piece of code handles streaming and buffered replies, so the client sees the same content either way.

Other Claude Code proxies route to many providers. Clodex supports only Codex, and has no API-key mode. The author argues the narrow focus makes tool calls, usage counts and errors more reliable. The README warns that the proxy has no authentication, and that using your ChatGPT credentials this way puts your account at risk.

What it does

Anthropic-to-Codex translation
Claude Code talks to Clodex as it would to Anthropic. Clodex translates requests and responses, including streaming, tool calls and reasoning.
One-command launcher
clodex claude reuses a running proxy or starts one on 127.0.0.1:8484. It then launches Claude Code pointed at it, with the context window set from the chosen model.
Model and effort selection
Models use a slug[:effort][:fast] format, for example gpt-6-sol:high:fast. The model list is fetched live, with a built-in fallback list.
Reuses Codex CLI login
clodex auth login (browser) and clodex auth device (device code) write the shared ~/.codex/auth.json that the Codex CLI also uses.
Retries and status endpoint
Configurable retries, backoff and a circuit breaker handle upstream failures. A /status route shows plan, rate limits and recent call timings.

What you could build

Run Claude Code's terminal workflow with a GPT Codex model instead of a Claude model.
Point an existing Claude Code install at a local proxy using ANTHROPIC_BASE_URL.
Compare Codex models at different effort levels inside the same agent harness.
Study how the Anthropic Messages API maps onto a Responses-style protocol.
Count tokens offline through the local count_tokens endpoint.

Get started

Install Claude Code, then download the release binary for your platform (or build with Go 1.26+). Log in with clodex auth login, then start Claude Code through the proxy with clodex claude.

go build -o clodex ./cmd/clodex

clodex auth login

clodex claude

Commands are copied from the project's README. Read it on GitHub for the full setup.