What is bring your own LLM (BYO LLM)?

Bring your own LLM (BYO LLM) is an AI-agent architecture that lets organizations choose, change, and combine the large language models powering their customer interactions rather than relying on a platform’s bundled model. It separates responsibility for model selection, prompts, reasoning, tools, and business-system integrations from responsibility for communication channels, real-time voice handling, customer context, identity resolution, and escalation to human agents. The approach is presented as a way to reduce vendor lock-in, adapt to changing model capabilities and prices, meet compliance requirements, and route simpler tasks to lower-cost models while reserving more capable models for complex work. The article describes adding third-party models to an existing contact center through middleware rather than replacing the contact-center platform, emphasizing preservation of conversation history during AI-to-human handoffs. Twilio positions its Agent Connect SDK as such a middleware layer, supporting self-hosted Python and TypeScript integrations across voice, SMS, WhatsApp, RCS, and chat, while connecting AI agents to Twilio’s context, routing, and handoff services.

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