Best AI Gateway to Route Codex CLI to Any Model

Codex CLI is OpenAI's terminal-based coding agent that runs entirely in your shell. It reads your codebase, proposes changes, runs commands, and writes code. Solid tool. One problem: it only talks to OpenAI by default. I wanted to route Codex CLI through an AI gateway so I could use Claude Sonnet, Gemini 2.5 Pro, Mistral, and others without switching tools. I tested a few options. Bifrost worked best. Open-source, written in Go, 11 microsecond overhead. Here is exactly how I set it up and what...