> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.uponai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Speech Recognition Provider Comparison

> Understand how UponAI's speech recognition providers differ and how the platform auto-routes to the best fit for your selected languages.

UponAI automatically picks a speech recognition provider based on the languages your agent is configured for. You don't need to choose one manually, but understanding the trade-offs helps when deciding which languages to support.

<Info>
  These observations are based on internal testing and routing rules. Results may vary depending on specific languages, audio conditions, and call patterns.
</Info>

## 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 |

<Note>
  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](/build/configure-multilingual) for details.
</Note>