[user34283]

When I tried 5.2 Codex in GitHub Copilot it executed some first steps like searching for the relevant files, then it output the number "2" and stopped the response.

On further prompting it did the next step and terminated early again after printing how it would proceed.

It's most likely just a bug in GitHub Copilot, but it seems weird to me that they add models that clearly don't even work with their agentic harness.