Claude Code vs Codex: Outage Differences & Uptime Comparison [AI Coding]
Claude Code (Anthropic) and Codex (OpenAI) are leading AI coding agents that run in your terminal or editor. Because both depend on an upstream API (Claude API / OpenAI API), their outages share some traits and differ in others. Check each one's current status in the table above as we lay out the differences and how to switch.
Status comparison (live)
| Service | Status | 24h uptime | 7d uptime |
|---|---|---|---|
| Claude Code | Operational | 100% | 100% |
| Codex | Operational | 91.49% | 94.68% |
Uptime is our own estimate (share of operational), not official vendor figures, based on data since monitoring began.
What do they depend on? (Tracing the source of outages)
Claude Code depends on Anthropic's Claude API, while Codex depends on OpenAI's API/infrastructure. As a result, both share the same kind of outage: "the tool itself is fine, but errors occur because the upstream API is overloaded." The table above reflects the status of each tool's provider (Anthropic / OpenAI).
How their errors show up
For Claude Code, typical messages include "Claude usage limit reached," "API Error: 529 (overloaded)," "Connection error," and MCP server connection failures. If you hit your plan's (Pro/Max) 5-hour window or weekly limit, you have to wait until it resets.
For Codex, the main issues are usage limits on the ChatGPT plan side, plus OpenAI API 429 (rate limit) and 5xx errors. These often show up as a task not progressing or no result coming back.
For both, the cause is frequently "a limit or overload rather than a misconfiguration," in which case the basic fix is to wait or raise your plan/quota. Specific remedies are gathered on each error page (/errors).
Switching when one stalls
If one stops due to a limit or outage, the practical move is to switch to the other, or to Cursor / GitHub Copilot. Breaking tasks into smaller pieces and switching to a lighter model makes you less likely to hit limits.
Pick the side in the table above that is "normal" and has higher uptime to minimize wait time.
FAQ
Do Claude Code and Codex go down at the same time?
Their providers (Anthropic / OpenAI) are different, so they normally run independently. However, during hours when demand spikes across the whole industry, both can slow down. Check both in the table above.
Which is more likely to hit a usage limit?
Both depend on your plan's quota. As a rough guide, Claude Code uses a 5-hour window plus a weekly cap, while Codex follows your ChatGPT plan's quota. Running large or long-running tasks back to back makes you more likely to hit a limit.