The interesting shift here isn't "AI that writes code" — it's where the work happens. Instead of suggesting completions inside your editor, each task is handed off to an isolated cloud sandbox with your repository already loaded, then runs unattended for 1–30 minutes and hands back command logs, test results, and a diff to review. You delegate, then check the receipts.
What Sets It Apart
- Sandbox-per-task means many jobs run in parallel without touching your machine; the agent reads files, edits them, and executes your test suite to self-verify before returning.
- It returns evidence, not just code — logs and test output let you judge a change instead of trusting it blindly.
- The same agent reaches you through ChatGPT web, a CLI, desktop apps, and IDE plugins, so the handoff point fits your existing workflow rather than forcing a new editor.
- Backed by models tuned specifically for software engineering (codex-1, later GPT-5.x-Codex variants), trained on real PR-style tasks rather than generic completion.
Who It's For
Great fit if you have well-tested repositories and want to offload self-contained chunks — bug fixes, refactors, scoped features — and review the result like a colleague's PR. Look elsewhere if you want tight inline autocomplete while typing, work in a codebase with thin test coverage (the agent's self-checking has less to lean on), or need a model-agnostic tool: this is OpenAI's stack end to end.