Codex with ChatGPT Reroutes Expensive AI Reasoning to Your Flat-Rate Subscription
A new open-source bridge lets ChatGPT Plus/Pro handle planning while Codex handles execution, saving API tokens without uploading your repo.
PRO- New MIT-licensed repo codex-with-chatgpt routes planning to ChatGPT Pro, execution to Codex.
- Uses a read-only MCP bridge with 8 tools; workspace is never uploaded wholesale.
- ChatGPT independently reviews git diffs and test output instead of trusting agent claims.
- OAuth 2.1 with PKCE, one-time pairing codes, and hard-blocked write/shell tools by design.
- Cloudflare Quick Tunnel exposes a loopback bridge; requires Node 20+, git, cloudflared.
- Solves the imbalance of idle ChatGPT subscriptions while Codex burns metered API tokens.
If you pay for ChatGPT Plus or Pro, that subscription sits idle in a browser tab while your Codex agent burns through metered API tokens doing the heavy reasoning. Codex with ChatGPT, an MIT-licensed project now past 2,000 GitHub stars, reroutes planning and code review through the ChatGPT web UI and leaves Codex to handle execution only.
The result: expensive reasoning moves to the flat-rate subscription you already pay for, and the metered agent stays focused on edits, shell commands, and tests.
A split-brain loop, not a monolith
Most coding agents run as a single loop where one model plans, executes, and reviews its own output. This project separates those roles across two models connected by a read-only Model Context Protocol bridge. Codex and ChatGPT exchange compact structured [C2C] state messages following a fixed sequence: INIT, PLAN, EXECUTED, REVIEW, DONE. No diffs, logs, or file bodies are pasted between them.
ChatGPT pulls what it needs through eight read-only MCP tools:
workspace_infolist_directoryread_filesearch_workspacegit_statusgit_difftest_status
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