Hi Vapi team, I’m having a recurring production issue with assistant Lidia. Assistant ID: 908cf588-1470-468a-bc94-9c9d1dd1454e Model: Anthropic / claude-opus-4-6 Setup: Anthropic managed by Vapi, not BYOK Affected calls: 019e21e2-7c12-7000-9f37-bb272ace3a36 019e21f3-1426-7000-b4e6-093221d8ce48 019e21fb-fc0a-7001-b5bc-f1c347b42aa8 All ended after ~5 min with: call.in-progress.error-vapifault-anthropic-429-exceeded-quota I have Vapi credits available, so this seems like a Vapi-managed Anthropic quota/capacity issue. Can you urgently confirm if there are limits on Claude Opus and how to prevent live calls from dropping?

I’ve seen this happen before with Vapi-managed Anthropic models, especially on Claude Opus during higher load periods. Since you still have Vapi credits, it’s likely tied to provider-side rate limits/capacity rather than your balance. I can help you troubleshoot and stabilize it by checking model fallback handling, retries, concurrency limits, and whether switching temporarily to BYOK or another model tier would prevent live call drops. @Estefan

Hi, I can help investigate this. It does sound like a Vapi-managed Anthropic quota/capacity issue rather than your credits, especially with multiple live calls failing on anthropic-429-exceeded-quota. I’ve worked on similar Vapi production issues and can help identify the cause and suggest ways to prevent live call drops. Happy to take a look. @Estefan

Hi Vapi team, the Anthropic 429 quota issue has returned. Assistant: Claudia Assistant ID: 187efdae-ceab-43ee-ae12-1ebbc716de31 Setup: Anthropic managed by Vapi, not BYOK Call ID: 019e26f0-2963-7000-9238-86fc1d12f073 Error: call.in-progress.error-vapifault-anthropic-429-exceeded-quota This also happened before with assistant Lidia. I have Vapi credits available and no Anthropic BYOK, so this looks like a Vapi-managed Anthropic quota/capacity issue. Can someone urgently confirm the root cause and how to prevent live calls from dropping?

Hi, Thank you for reporting this and providing the specific Call IDs.