OpenAI Codex (Cloud)
Agent / Orchestration · Background async tasks (issue triage, refactors, doc generation) running in a managed cloud sandbox
At a glance
| Setup effort | Zero |
| Released | 2025 |
| Open source | No |
| Interface | Web / In-editor |
| Model choice | Fixed (OpenAI) |
| Guardrails | Sandboxed |
| Cost | Bundled with ChatGPT Plus/Pro/Team |
| Autonomy | Autonomous |
| Capabilities | Cloud sandbox, Multi-step planning, Long-running tasks, PR generation, GitHub integration, Voice, MCP |
What OpenAI Codex (Cloud) does
Cloud sandbox, Multi-step planning, Long-running tasks, PR generation, GitHub integration, Voice, MCP
Best for
Background async tasks (issue triage, refactors, doc generation) running in a managed cloud sandbox
Works well with
LLM Provider / Model
Integration
Context / RAG
Conflicts & caveats
- OpenAI Codex (Cloud) runs GPT-5.1 Codex internally — your selected Claude Sonnet 4.6 will be ignored.
- OpenAI Codex (Cloud) with Amazon Nova Micro (≤8K max output) may struggle with multi-file edits. Use models with 16K+ output capacity.
- ⚠️ OpenAI Codex (Cloud) with on-demand context "Continue codebase indexing" may act on stale code — prefer real-time context (Cursor @codebase, Greptile, GitHub Copilot indexing, Augment Context, CocoIndex, turbopuffer).
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