These observations are based on internal testing and routing rules. Results may vary depending on specific languages, audio conditions, and call patterns.
Provider Overview
Deepgram
- Best for: Lowest latency — the default for single-language agents on common languages
- Multilingual: Supports code-switching across 10 languages: English, Spanish, French, German, Hindi, Russian, Portuguese, Japanese, Italian, Dutch
- Consideration: Doesn’t cover less-common languages (e.g., Welsh, Marathi, Kazakh)
Azure
- Best for: The broadest single-language coverage — including languages no other provider supports (e.g., Icelandic, Nepali, Filipino)
- Consideration: No multilingual mode. Used only when the agent is configured with a single language.
Soniox
- Best for: Multilingual code-switching across a much wider set than Deepgram — about 50 languages, with the same coverage in both single and multi modes
- Consideration: Slightly higher latency than Deepgram, so UponAI prefers Deepgram when both providers support a language
How UponAI Picks a Provider
UponAI evaluates the agent’s selected languages against each provider’s coverage and routes to the most accurate option:| Scenario | Provider chosen |
|---|---|
| Single common language | Deepgram |
| Single uncommon language (not covered by Deepgram) | Azure |
| Multiple languages, all within Deepgram’s multilingual set | Deepgram multilingual |
| Multiple languages, broader combination | Soniox |
| Multiple variants of the same base language (e.g., en-US + en-GB) | Routed as single-language — no accuracy penalty |
If no single provider can cover all of your selected languages together, the dashboard prevents you from selecting that combination. See Configure a multilingual agent for details.