How to Run OpenAI Codex with Any AI Model, not just ChatGPT Pro

Post Details

Company

Eden AI

Date Published

May 7, 2026

Author

Last updated on May 8, 2026 Samy Melaine Samy Melaine is the CTPO and co-founder of Eden AI. He brings a technical perspective shaped by technical development, AI/ML engineering, and a clear focus on production-grade AI systems. His work is centered on gi

Word Count

1,252

Language

English

Hacker News Points

-

Source URL

www.edenai.co/post/how-to-run-openai-codex-with-any-ai-model

Summary

OpenAI Codex, a cloud-based autonomous coding assistant, is limited by its default dependence on OpenAI models, which presents challenges such as cost lock-in, lack of fallback options, and inability to optimize model use for specific tasks. Different models like Claude 3.7 Sonnet, Gemini 2.0 Flash, and Mistral Codestral offer varied strengths such as complex reasoning, speed, and cost efficiency, but Codex users cannot leverage these due to its default setup. An AI Gateway, such as Eden AI, acts as a middleware that allows users to access over 500 models from 50+ providers by routing requests through a unified endpoint compatible with OpenAI's API format. This setup enables automatic fallback, smart routing, and cost tracking, offering significant cost reductions and enhanced flexibility without altering the Codex configuration. Eden AI provides a seamless transition by simply changing the base URL and API key, making it possible to switch models effortlessly and maintain uninterrupted Codex sessions.