Hi @cloud_LNU,
We recently made some backend updates to ensure that all 429 errors come with a description field which properly explains the cause. We recommend scanning your logs for these. Please check the AI Studio Usage (https://aistudio.google.com/usage), Rate Limit (https://aistudio.google.com/rate-limit), and Billing (https://aistudio.google.com/billing) pages. Common causes include tier drops, prepay funds depleted, spend cap exceeded, or reaching per-minute/per-day rate limits. For retry and rate-limiting guidance, see: Handling 429 / 503 errors from the Gemini API