### Answer Retell LLM models do not have built-in web search abilities. The models available on the Retell platform, including Claude 5 Sonnet, do not come with native web search tools. [(1) ]() [(2) ]() However, you can add web search functionality to your Retell agents through custom functions. Function calling allows your agent to take real actions like calling external APIs, which could include web search APIs. To implement web search, you would need to: 1. Create a custom function that calls a web search API (like Google Search API, Bing Search API, etc.) 2. Configure this function as a tool that your agent can use 3. Provide clear instructions in your prompt about when to use the web search function [(1) ]() [(3) ]() The custom function feature supports making GET, POST, PUT, PATCH, and DELETE requests with custom headers and query parameters, which gives you the flexibility to integrate with various search APIs. [(4) ]()

​ To learn more, see the sources I considered: [[1] Function Calling Overview](https://docs.retellai.com/build/single-multi-prompt/function-calling) [[2] Integrate Function Calling](https://docs.retellai.com/integrate-llm/integrate-function-calling) [[3] Prompt Engineering Guide](https://docs.retellai.com/build/prompt-engineering-guide) [[4] Platform Changelogs | Retell AI](https://www.retellai.com/changelog) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.