Use any model and provider with the official OpenAI Codex Desktop App without modifying its code

Use any model and any provider with the official OpenAI Codex Desktop App, without modifying its code, and continue to use the official models in parallel?

Reddit user thibautrey describes a 3-step setup: edit Codex Desktop config.toml, store an API key, and use a multicodex proxy alias to map gpt-5.3-codex to MiniMax-Latest. The post lists a local base_url of 127.0.0.1:1455 and says the proxy disguises returned model names as gpt-5.3-codex.

Why it matters: This is a reproducible developer workflow trick, not an official release. HKR-H comes from the lock-in workaround, HKR-K has concrete config details, and HKR-R hits cost and model-choice pressure, placing it at the tutorial featured threshold.