DeepInfra has introduced a Function Calling feature to its platform, enhancing the capabilities of open-source LLMs like Mistral-7B and Mixtral-8x7B by allowing them to call external user-provided functions and use the results to generate comprehensive responses. Originally pioneered by OpenAI, this feature addresses the limitation of LLMs in performing tasks that require external knowledge integration. The Function Calling capability enables users, particularly developers, to provide specific functions that the models can execute, with potential applications in real-time data processing, complex math problem solving, and enhancing AI virtual assistants. Through a detailed example involving weather data retrieval, the article demonstrates how this feature can be implemented, showcasing the model's ability to interact with external functions dynamically. DeepInfra aims to make this advanced functionality more accessible and affordable, encouraging developers to leverage it for building robust applications, while also inviting user feedback through its community channels.