Anthropic API 8 limits oldest check 27 Aug 2026 8 within 30 days
Quota reset forecaster
Check documented reset boundaries. Your account notice takes priority.
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time to reset
Published limits
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| Plan | Limit | Window | When exhausted | Evidence |
|---|---|---|---|---|
| Start | 1,000 per minute Opus 5 — requests | token bucket | 429 with retry-after header | ● Documented |
| Anthropic API rate-limit reference, fetched 2 Aug 2026. | ||||
| Start | 2,000,000 per minute Opus 5 — input tokens | token bucket | 429 with retry-after header | ● Documented |
| Cached reads do not count toward ITPM on Opus 5, so effective throughput is far higher than the headline number. | ||||
| Start | 400,000 per minute Opus 5 — output tokens | token bucket | 429 with retry-after header | ● Documented |
| Measured on tokens actually generated; max_tokens does not count against OTPM. | ||||
| Build | 5,000,000 per minute Opus 5 — input tokens | token bucket | 429 with retry-after header | ● Documented |
| Anthropic API rate-limit reference, Build tier. | ||||
| Scale | 10,000,000 per minute Opus 5 — input tokens | token bucket | 429 with retry-after header | ● Documented |
| Anthropic API rate-limit reference, Scale tier. | ||||
| Start | $500 per calendar month Monthly spend cap | calendar month | API usage pauses until next month | ● Documented |
| Spend caps are separate from rate limits: Start $500, Build $1,000, Scale $200,000. | ||||
| Build | $1,000 per calendar month Monthly spend cap | calendar month | API usage pauses until next month | ● Documented |
| Anthropic API rate-limit reference. | ||||
| Scale | $200,000 per calendar month Monthly spend cap | calendar month | API usage pauses until next month | ● Documented |
| Custom tier has no monthly spend cap. | ||||