Supported languages

Every language ThunderPhone agents can speak, which voices support each one, and how per-minute pricing differs between included and premium languages.

ThunderPhone agents speak 47 languages with 127 voices. A call starts in the agent's primary language and switches automatically when a caller uses one of the agent's additional languages. Set both in the agent builder's Config tab, or via the primary_language and additional_languages fields on the Agent.

Keep one voice or switch to native voices#

By default, the agent keeps its configured voice when it switches languages. Open Voice Agents, select the agent, and in Config add at least one language under Additional languages. Turn on Switch to native voices, test the draft in Talk, and select Deploy.

The switch uses a catalog voice native to the detected additional language, matched to the configured voice's gender. The agent returns to its configured voice for the primary language and keeps the current voice if no match is available. Custom voices do not switch automatically. The switch itself has no surcharge; a premium language still adds its listed price. API clients can set native_voice_switching: true through the Agents API.

Two pricing tiers:

• Included languages (15) cost nothing beyond the agent's engine rate.
• Premium languages (32) add +3¢/min to the agent's per-minute rate.