Anthropic Rate Limits by Tier
What are Anthropic's API rate limits?
Anthropic's entry tier (Tier 1) allows 50 requests/min and 50,000 tokens/min for claude-haiku-4-5. Limits scale up through Tier 4 as cumulative spend and account age increase — see the full table below, verified 2026-08-09.
Limits by tier
| Tier | Qualification | Model class | RPM | TPM | RPD | Concurrent |
|---|---|---|---|---|---|---|
| Tier 1 | $5 cumulative spend | claude-haiku-4-5 | 50 | 50,000 | — | 5 |
| Tier 2 | $40 cumulative spend, 7 days since first payment | claude-haiku-4-5 | 1000 | 100,000 | — | 20 |
| Tier 4 | $5,000 cumulative spend, 30 days since first payment | claude-haiku-4-5 | 4000 | 400,000 | — | 100 |
— means not documented by Anthropic, never a guess.
Response headers
anthropic-ratelimit-requests-remaining | Requests left in the current window |
anthropic-ratelimit-tokens-remaining | Tokens left in the current window |
retry-after | Seconds to wait before retrying, sent only on a 429 |
When you exceed the limit
Anthropic returns HTTP 429.
Back off for the duration in retry-after, then retry with jittered exponential backoff. Requests and tokens are limited separately — a token-limit 429 needs a smaller batch, not just a delay.
FAQ
What happens when I exceed Anthropic's rate limit?
Anthropic returns HTTP 429 with a retry-after header telling you how long to wait. Back off for the duration in retry-after, then retry with jittered exponential backoff. Requests and tokens are limited separately — a token-limit 429 needs a smaller batch, not just a delay.
How do I request a rate limit increase on Anthropic?
Request one from the account dashboard: https://console.anthropic.com/settings/limits