Vapi is the Voice AI platform for developers.

Vapi AI

I noticed that are problems with you lastest "ChatGPT 4o(latest) Cluster" "An error occurred in this call: call.in-progress.error-pipeline-no-available-llm-model" you can verify at call id: 626d286b-c93a-42c5-9e87-90dfbebeefa3

**The error `call.in-progress.error-pipeline-no-available-llm-model` means no suitable LLM was available to process your call.**  
To address this, try specifying a different or fallback model in your assistant configuration. For example:

```json
"model": { "provider": "openai", "model": "gpt-4" },
"fallbackModels": [{ "provider": "openai", "model": "gpt-3.5-turbo" }]
```

If the issue persists, check your model provider's status or contact support with your call ID for further investigation.

Sources:
- [Call ended reasons (Vapi docs)](https://docs.vapi.ai/calls/call-ended-reason)
- [Assistant hooks and error handling (Vapi docs)](https://docs.vapi.ai/assistants/assistant-hooks)

I recently found out that GPT 4.0 latest doesn't support Tools Calling.  So I'm no longer interested in using it given this limitation. Thank you very much for your help. I didn't initially realize this limitation.

I just ran into this error as well. What is the ideal model for basic workflow in vapi?

@conic This ticket has been marked as solved, and as a result, you will no longer receive any further responses. Kindly create a new support ticket to escalate your inquiry.&nbsp;