Building a Mistral Medium Voice Agent with Vapi

Mistral Medium 3 is a new voice AI model that combines high performance with cost efficiency, making it suitable for complex conversational AI applications. Launched in May 2025, it embodies Mistral AI's philosophy of "medium is the new large," offering 90% of premium model performance at affordable pricing. The model features a 128K token context window and multimodal capabilities, allowing it to handle complex, extended interactions and process both text and image inputs. Despite requiring a Bring Your Own Model (BYOM) approach for deployment on Vapi's platform, Mistral Medium 3 excels in scenarios that demand technical support, complex reasoning, and document discussion. It offers a balance of real-time processing and nuanced conversation handling, although setup complexity and direct billing management are considerations for potential users. The model's advanced capabilities make it particularly well-suited for technical support, customer service, and enterprise applications, while its integration with Vapi's BYOM platform facilitates smooth deployment of sophisticated voice assistants.