Expired70% confidenceFactExact time
Codex runs in a cloud-based sandbox environment inside ChatGPT, capable of cloning a user's code repository, executing code in an isolated container, running test suites, and submitting changes in the form of Pull Requests.
4
Sources
70%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 9/30/2026(expired)
Sources
Codex vs. Cloud Code Practical Guide: Mastering AI Coding Agents from Beginner to Expert
bilibili大模型阿琴6/10/2026
Related Claims
UnverifiedCodex uses an asynchronous task mode, independently completing code modifications in a cloud sandbox environment and returning results in the form of a Pull Request.78% similarUnverifiedChatGPT Codex can independently execute complete software engineering tasks, including reading codebases, writing code, running tests, and submitting PRs.73% similarUnverifiedCodex has a context window of 200K tokens and supports autonomously completing complex programming tasks in a sandbox environment.71% similarUnverifiedWhen entering instructions under cloud task mode, the instructions are sent to Codex Cloud for remote execution, whereas operating in the regular chat window runs locally.70% similar
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