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TruGen supports conversations in 60+ languages. The speech pipeline uses Deepgram, AssemblyAI, and Speechmatics for transcription (STT) and ElevenLabs, Cartesia, Rime, Fish Audio, and Inworld TTS for voice synthesis (TTS): all of which auto-adapt when you use multi mode.

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Quick start

For agents that need broad language coverage without picking a specific language, use multi:
The STT engine auto-detects the spoken language, and TTS renders in the same language. Works for the most common cross-language flows. For a specific language, use its code (see tables below):

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Supported languages

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European

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Asian & Pacific

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Arabic

For code-switching or unknown language input, use language: "multi". The STT engine auto-detects on each utterance, and TTS renders accordingly.

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Setting the language

Full agent creation with a multilingual configuration: see the Create Agent reference for every field.

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Provider language coverage

Provider language coverage evolves. Always check the source docs for the very latest list.

Deepgram Nova-3

Broadest STT language coverage and high accuracy.

AssemblyAI Universal

Real-time multilingual code-switching STT.

Cartesia Sonic

Low-latency multilingual streaming TTS.

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Prompt considerations for multilingual agents

  • Respond in the same language as the user. Add this instruction explicitly: LLMs sometimes default to English.
  • Watch for code-switching. Users often mix languages (“Book me a table para dos”). Multi mode handles input; instruct the LLM to match the dominant language in output.
  • Test dialect variants. A single es model may transcribe es-MX fine but stumble on es-AR. If accuracy matters, pick the dialect explicitly.

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What’s next

Voices

Voice IDs and provider-specific settings.

Providers

Every supported STT, LLM, and TTS provider.