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Every Bolna agent uses three provider categories: a transcriber (speech-to-text), an LLM (language model), and a synthesizer (text-to-speech), plus a telephony provider to carry the call. Read the provider guides first to see what each one offers, then use this page to pick a combination for your use case.
Provider model lineups change frequently. The specific model names here are current examples — always check the relevant LLM provider page or the provider’s own docs for the latest recommended model.

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Quick decision guide

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Compare providers by category

Choose a transcriber

Speech-to-text providers compared by language and latency

Choose an LLM

Model tiers for cost, quality and data residency

Choose a voice

Text-to-speech providers compared by latency and language

Choose telephony

Telephony providers by region, or your own SIP trunk