Counted in messages, not dollars
OpenAI publishes Codex limits as messages per 5 hours, not dollars, so this row only counts against ChatGPT plans.
| Model | Local messages per 5 hours (ChatGPT Plus) |
|---|---|
| gpt-6-astra | 5–45 |
| gpt-6.1-sol | 15–160 |
| gpt-6-sol | 15–150 |
| gpt-6-luna | 350–3,000 |
Source: OpenAI Help: Codex usage limits, checked 2026-10-20. The calculator multiplies the range by the 5-hour windows you use per day.