Stack AI rate limits, context window & usage caps (2026)
Stack AI rate limits and run credits. Monthly flow runs, API requests and file storage caps by plan.
Stack AI usage limits by plan
| Runs | 100 runs/month | AI flow executions |
| Flows | 3 flows | |
| Users | 1 seat | |
| Storage | 100 MB |
| Runs | 1000 runs/month | |
| Flows | Unlimited | |
| Users | 3 seats | |
| Storage | 5 GB |
| Runs | Unlimited | |
| Flows | Unlimited | |
| Users | Unlimited | |
| Storage | Unlimited |
What happens when you hit Stack AI's limits?
Check the reset window - most limits refresh within 1–60 minutes
Reload or try again after the reset window passes
If you hit limits regularly, upgrade your plan to increase caps
Stack AI limit reset schedule
⚡
Per minute
API RPM limits - reset every 60 seconds
🕐
Per hour
Short rolling windows for message quotas
⏱
Per 5 hours
Common for consumer plan message limits
📅
Per day / month
Image gen credits and file storage caps
Exact reset period per limit type is shown in the "Notes" column of the plan table above. Stack AI uses rolling-window resets - quotas refresh continuously, not at a fixed midnight cutoff.
More Stack AI intelligence
Live status →
Check if rate limit errors are due to an active outage
Pricing →
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Limits sourced from Stack AI's official documentation. Updated when plan changes are announced.
Stack AI limits - frequently asked questions
What is the Stack AI message limit?
Stack AI message limits vary by plan - see the full breakdown by tier in the table above.
Does Stack AI have a file upload limit?
Yes, Stack AI enforces file upload limits that vary by plan. See the detailed breakdown above.
When do Stack AI limits reset?
Reset periods vary by limit type - many Stack AI limits reset on a rolling window (e.g., per 5 hours or per 24 hours). Check the notes column in the table above for specific reset schedules.
What happens when you hit Stack AI's rate limit?
Stack AI will temporarily block new requests when you exceed your plan's limits. You may see an in-app message or receive an HTTP 429 response. Wait for the reset window to pass or upgrade your plan.