Hi there, I've recently created a basic call transfer function it is a warm transfer summary. Very short concise prompting and I have ticked use assistant LLM for summary regeneration. I expect, the summary to be completed by the LLM attached to the assistant (grok4reasoning) Result: in the screenshot you can see it is randomly calling anthropic, where no tools in my organisation use anthropic. Not even an API key is attached. Help is appreciated please for this simple warm transfer. call id: 019a057a-771f-7995-9733-0c5650381224 timestamped: Oct 21, 17:37:33.060 AEST https://cdn.discordapp.com/attachments/1430090151278809128/1430090151866138765/image.png?ex=68f882bd&is=68f7313d&hm=e5ff76c2dcd0a03925efe9c55cee13c85721422cf428a1f98b5dd1141212cf3d&

It looks like Vapi is defaulting to Anthropic for summary generation, possibly due to a missing or misconfigured model in your

summaryPlan

. To ensure your assistant's LLM (Grok4Reasoning) is used, double-check your transfer configuration and make sure your

summaryPlan

does not specify a separate model. Here’s an example of a correct configuration:

json
"transferPlan": {
  "mode": "warm-transfer-with-summary",
  "summaryPlan": {
    "enabled": true,
    "messages": [
      { "role": "system", "content": "Please provide a summary of the call." },
      { "role": "user", "content": "Here is the transcript:\n\n{{transcript}}\n\n" }
    ]
    // No "model" property here
  }
}

If the issue persists, contact Vapi support with your call ID, as this may be a platform-level bug. [See documentation](https://docs.vapi.ai/call-forwarding) Source: - [Call Forwarding](https://docs.vapi.ai/call-forwarding)

"transferPlan": { "mode": "warm-transfer-say-summary", "sipVerb": "refer", "summaryPlan": { "enabled": true, "messages": [ { "role": "system", "content": "Give a very short summary of the lead data captured in the transcript. Example: Incoming sales enquiry for {{name}}, located {{location}} for {{service_status}}. Client plan status {{plan_status}} for {{service_stream}}" }, { "role": "user", "content": "Use the information in the transcript: {{transcript}}" } ], "timeoutSeconds": 5, "useAssistantLlm": true } },

We reviewed the call log and found that you are using a web call, which is not compatible with performing any call transfer whether it is warm-transfer or blind-transfer. Please initiate a PSTN or SIP call then try to transfer the call