Many developers assume Codex is a separate AI model from GPT-5.5. It is not.
Codex is powered by GPT-5.5, but OpenAI has packaged it inside a purpose-built software development environment. This environment includes tools for writing code, running tests, debugging applications, and managing large repositories more efficiently.
You can think of it this way:
GPT-5.5 is the underlying intelligence.
Codex is the engineering workspace built around that intelligence.
If you use ChatGPT for coding and are wondering whether Codex offers anything different, the answer is yes: the model is the same, but the workflow and tooling are optimized for professional development.
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