Hi, I have been setting summary prompt on the analysis (https://docs.vapi.ai/assistants/call-analysis#summary-prompt), but I found the model to not be enough for my use case and would of liked if I could upgrade it. Is it possible, I could not find any related docs?

**You cannot directly upgrade or change the Call Analysis model**—Vapi uses Anthropic's Claude Sonnet (with GPT-4o as fallback) by default. However, you can optimize results by customizing the analysis prompts. For example, to tailor the summary, set a custom prompt in your assistant's `analysisPlan`:

json
{
  "summaryPrompt": "Summarize the call focusing on technical details and unresolved issues."
}

This lets you guide the model's output even if you can't change the underlying model itself. For more, see the [Call Analysis documentation](https://docs.vapi.ai/assistants/call-analysis). Source: - [Call analysis](https://docs.vapi.ai/assistants/call-analysis)

I dont think its true, I see in logs gemini 2.5 flash is used

Hi, Thanks for reaching out. At the moment, it’s not possible to change or upgrade the model used for the call analysis summary. The summary prompt runs on a fixed internal model, and there isn’t a configuration option to select a different one yet.

Are there any plans to allow us to configure it?

Hi, Not at the moment. There isn’t a way to configure or change the model used for call analysis summaries right now. If that changes in the future, we’ll be sure to share an update. Thanks!