OpenAI Assistant 4 limits verified 2 Aug 2026
Quota reset forecaster
You hit a wall. When do you get it back?
—
time to reset
Published limits
| Plan | Limit | Window | When exhausted | Evidence |
|---|---|---|---|---|
| Plus / Go | 160 messages GPT-5.5 messages | rolling 3 hours | Silently switched to the mini model | ○ Observed |
| OpenAI stated this figure on 29 May 2026. It is absent from the permanent help-centre reference, and OpenAI notes limits may tighten at peak demand. | ||||
| Plus | 3,000 messages GPT-5.5 Thinking messages | rolling 7 days | Thinking unavailable until the window rolls | ○ Observed |
| Weekly cap reported alongside the 3-hour cap; not carried in the permanent reference docs. | ||||
| Plus | 80 uploads File uploads | rolling 3 hours | Upload blocked until the window rolls | ○ Observed |
| Reported with the same May 2026 update. | ||||
| Pro / Business / Enterprise | No stated cap Messages | abuse guardrails only | Guardrails apply but no published ceiling | ⨯ Undisclosed |
| OpenAI describes these tiers as effectively unlimited subject to abuse guardrails, and publishes no number. | ||||