xAI API 1 limits oldest check 27 Aug 2026 1 within 30 days
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Published limits
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| Plan | Limit | Window | When exhausted | Evidence |
|---|---|---|---|---|
| Tier 0 | 150 RPS / 50M TPM grok-4.6 limits | per second / per minute | 429 until capacity replenishes | ● Documented |
| xAI now publishes cumulative-spend tiers and hard per-model RPS and TPM limits; this corrects the former not-published claim. | ||||