Current documented limits
| Constraint | Current value | Scope | Verified source |
|---|---|---|---|
| Plus local-message rangeThe official Plus column ranges from 5–45 for GPT-6 Astra and 10–100 for GPT-5.6 Sol to 250–2,000 for GPT-5.6 Luna. | 5–2,000 messages per 5 hours, depending on model | ChatGPT Plus | OpenAISep 17, 2026 |
| Pro 5× local-message rangeThe Pro 5× column ranges from 25–225 for GPT-6 Astra and 50–500 for GPT-5.6 Sol to 1,250–10,000 for GPT-5.6 Luna. | 25–10,000 messages per 5 hours, depending on model | ChatGPT Pro 5× | OpenAISep 17, 2026 |
| Pro 20× local-message rangeThe Pro 20× column ranges from 100–900 for GPT-6 Astra and 200–2,000 for GPT-5.6 Sol to 5,000–40,000 for GPT-5.6 Luna. | 100–40,000 messages per 5 hours, depending on model | ChatGPT Pro 20× | OpenAISep 17, 2026 |
| post-allowance continuationPlus and Pro can purchase credits, while API-key chats use standard API billing. | Additional credits or API-key usage | Plan dependent | OpenAISep 17, 2026 |
How to apply Codex limits safely
The monitored baseline covers Plus local-message range, Pro 5× local-message range, Pro 20× local-message range, post-allowance continuation. Treat these as separate constraints rather than one platform-wide capacity number: a workload can fit one row and still fail another because the plan, model, endpoint, runtime, region, invocation mode, or account scope differs.
- Match the production workload to the exact scope printed beside each value and confirm it in the active Codex console, configuration, or response headers.
- Measure the serialized request, token volume, duration, concurrency, storage, or connection demand at realistic percentiles, then preserve headroom for bursts and retries.
- Check every adjacent layer—client, SDK, gateway, proxy, queue, database, and downstream service—for a smaller effective limit before changing architecture.
Specific limit pages
These pages exist because the constraint has a distinct implementation or troubleshooting intent. Closely related keyword variations stay consolidated.
Codex Plus Local Message Limits
Codex Plus Local Message Limits, verified against Codex's official documentation with scope, implementation impact, caveats, and a direct check.
Codex Pro 5× Local Message Limits
Codex Pro 5× Local Message Limits, verified against Codex's official documentation with scope, implementation impact, caveats, and a direct check.
Codex Pro 20× Local Message Limits
Codex Pro 20× Local Message Limits, verified against Codex's official documentation with scope, implementation impact, caveats, and a direct check.
Codex Credits & Usage After Plan Limits
Codex Credits & Usage After Plan Limits, verified against Codex's official documentation with scope, implementation impact, caveats, and a direct check.