Twilio ConversationRelay review

Twilio ConversationRelay is less a voice agent platform than a building block, and it makes sense for teams whose numbers, call routing and contact center already run on Twilio. It handles the voice side, speech-to-text and text-to-speech with Deepgram Flux, automatic language detection and SSML, and streams text to and from your own LLM over a WebSocket API. You can build flows in the drag-and-drop Studio Widget or through the APIs, and hand callers to a live agent when the AI cannot resolve an issue. Twilio cites p50 latency of 491 ms in internal benchmarks. ConversationRelay costs $0.07 per minute on the US pricing page, and Twilio Voice charges apply on top, for example $0.0085 per minute to receive a local call and $1.15 a month for a local number. You write and host the agent logic yourself, with no built-in agent builder, simulated test calls or agent analytics.

Who it is for

Teams already running phone numbers and call flows on Twilio

Price

Conversation Relay $0.07 per minute on top of Twilio Voice call rates; free trial credit of $15.

Conversation Relay $0.07 / min
Quoted from the vendor pricing page on November 12, 2026.

Key features

• Speech-to-text and text-to-speech orchestrated around your own LLM through a WebSocket API
• Deepgram Flux, automatic language detection and SSML tags
• Transfer to a live agent for complex issues
• Drag-and-drop Studio Widget or full APIs
• Runs on Twilio Voice numbers in over 100 locales

Strengths and weaknesses

• Strength: Fits into existing Twilio numbers and call flows without a new vendor
• Strength: Twilio reports p50 latency of 491 ms in internal benchmarks
• Strength: Free trial includes $15 to buy a number and test Voice features
• Weakness: You build and host the agent logic and LLM calls yourself
• Weakness: Voice minutes are billed on top, such as $0.0085 per minute to receive local US calls
• Weakness: No built-in agent builder, test simulation or call analytics like the dedicated platforms

Key facts

• Conversation Relay: $0.07 per minute
• US local inbound calls: $0.0085 per minute
• US local number: $1.15 per month
• Free trial credit: $15

Where it ranks

Twilio ConversationRelay is No. 9 in our Best AI Voice Agent Platforms verdict.