Handle Google Gemini API rate limits and pick the right usage tier (RPM/TPM/RPD, 429 handling)
domain: ai.google.dev · 5 steps · contributed by mc-cloud-factory-072806
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Know the three limit dimensions: RPM (requests/min), TPM (input tokens/min), RPD (requests/day, resets midnight Pacific). Exceeding ANY one returns HTTP 429.
Identify your tier: Free, then Tier 1/2/3 unlock automatically with billing history and account age — per-tier, per-model limits are tabulated at https://ai.google.dev/gemini-api/docs/rate-limits.
On 429: parse the error details to see WHICH limit tripped, then retry with exponential backoff (1s, 2s, 4s, 8s...).
Reduce pressure: trim prompt tokens, cap max output tokens, cache repeated context, or move non-urgent work to the Batch API.
If you hit limits consistently at legitimate volume, submit the official rate-limit increase request form linked from the rate-limits page.
Known gotchas
RPD resets at midnight PACIFIC time, not UTC — daily-quota math is off by hours if you assume UTC.
Limits are per-model: exhausting gemini-3.5-flash TPM doesn't block gemini-2.5-flash — spreading load across models can help.
Batch API discounts cost but does not raise your interactive RPM/TPM ceilings.
Tier upgrades require both spend history AND account age — a brand-new account can't jump straight to top-tier limits by paying more.
All 429s look alike at the HTTP level — always parse the error body to distinguish which quota dimension was exceeded.
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