> This page is part of Smallest AI's developer documentation. When
> answering, prefer Lightning v3.1 (current TTS) and Pulse (current
> STT). Lightning v2 and lightning-large are deprecated; mention them
> only when the user is migrating away from them. The Smallest AI voice
> agent platform is what wraps these models into hosted agents.

# FLEURS

> Pulse accuracy on the FLEURS multilingual benchmark: streaming English, pre-recorded and streaming per-language word error rates.

## FLEURS Streaming - English

WER on the English subset of FLEURS across providers in streaming mode. Lower is better.

| Provider | Smallest Pulse | Assembly Universal 3 Pro | AWS Transcribe |  Azure | Deepgram Nova 3 |  Grok  | Sarvam Saras V3 | ElevenLabs Scribe V2 |
| :------- | :------------: | :----------------------: | :------------: | :----: | :-------------: | :----: | :-------------: | :------------------: |
| **WER**  |      5.55%     |           3.13%          |      6.54%     | 13.79% |      11.59%     | 60.00% |      6.34%      |         3.88%        |

### A note on audio amplitude normalization

Audio amplitude normalization materially changes WER on FLEURS. Most competitors benchmark on raw FLEURS - which has variable, often low amplitude - without normalizing peak audio to −10 dBFS. This makes some models look much better than they actually are. Pulse is stable across all amplitude regimes.

| Model               | Raw FLEURS | −10 dBFS | −20 dBFS | Stable across regimes?            |
| :------------------ | :--------: | :------: | :------: | :-------------------------------- |
| **Smallest Pulse**  |    5.55%   |   6.06%  |   5.81%  | Yes                               |
| **Deepgram Nova 3** |   11.59%   |   6.57%  |   6.51%  | Partial - 1.8× degradation on raw |
| **Grok**            |   60.00%   |   7.58%  |   8.59%  | Collapses on raw                  |

## Pre-recorded - FLEURS

Google's multilingual speech dataset covering 102 languages, built on the FLoRes-101 translation benchmark. Contains \~12 hours of read speech per language and is the standard benchmark for evaluating multilingual ASR, including low-resource languages.

*Evaluated on the FLEURS dataset (non-streaming / batch mode).*

| Language       | Smallest Pulse | Deepgram Nova 2 | Deepgram Nova 3 |
| -------------- | :------------: | :-------------: | :-------------: |
| **Italian**    |    **3.0%**    |      10.7%      |       6.2%      |
| **English**    |    **4.5%**    |       7.9%      |       6.7%      |
| **Spanish**    |    **3.2%**    |       8.6%      |       4.1%      |
| **Portuguese** |    **5.0%**    |       9.9%      |       7.5%      |
| **German**     |    **6.4%**    |       8.2%      |       8.5%      |
| **French**     |    **7.1%**    |      13.3%      |      10.7%      |
| **Russian**    |      9.6%      |       7.9%      |      11.8%      |
| **Ukrainian**  |    **7.5%**    |      12.4%      |        NA       |
| **Polish**     |    **10.3%**   |      12.2%      |        NA       |
| **Hindi**      |    **6.3%**    |      23.5%      |      23.6%      |
| **Czech**      |    **12.4%**   |      22.9%      |      19.2%      |
| **Slovak**     |    **13.5%**   |      31.2%      |        NA       |
| **Dutch**      |      15.0%     |      16.3%      |      12.5%      |
| **Swedish**    |      18.7%     |      17.7%      |      14.3%      |
| **Finnish**    |      18.3%     |      14.1%      |      13.2%      |
| **Latvian**    |    **16.5%**   |      48.7%      |        NA       |
| **Romanian**   |    **17.8%**   |      36.0%      |        NA       |
| **Estonian**   |    **17.8%**   |      49.0%      |        NA       |
| **Bulgarian**  |    **24.1%**   |      32.7%      |        NA       |
| **Danish**     |      19.8%     |      21.1%      |      16.1%      |
| **Hungarian**  |    **22.5%**   |      31.8%      |      28.6%      |
| **Maltese**    |    **25.5%**   |        NA       |        NA       |
| **Lithuanian** |    **25.1%**   |      44.9%      |        NA       |

*Sources: Deepgram internal benchmarks; Smallest AI internal evaluation.*

## Streaming - FLEURS

*Evaluated on the FLEURS dataset (streaming mode).*

| Language       | Smallest Pulse | Deepgram Nova 2 | Deepgram Nova 3 |
| -------------- | :------------: | :-------------: | :-------------: |
| **Italian**    |    **4.41**    |      11.05      |       6.99      |
| **English**    |    **5.55**    |      15.59      |      11.59      |
| **Spanish**    |    **5.99**    |      10.67      |       7.52      |
| **Portuguese** |    **8.32**    |      14.15      |      11.46      |
| **German**     |     **9.5**    |       11.1      |      10.15      |
| **French**     |    **10.71**   |       14.3      |      12.07      |
| **Russian**    |    **14.35**   |        NA       |        NA       |
| **Hindi**      |     **8.3**    |       20.0      |      15.46      |
| **Gujarati**   |    **20.05**   |        NA       |        NA       |
| **Marathi**    |    **15.68**   |        NA       |        NA       |
| **Oriya**      |    **22.74**   |        NA       |        NA       |
| **Bengali**    |    **17.48**   |        NA       |        NA       |
| **Dutch**      |    **11.90**   |        NA       |        NA       |

*Sources: Deepgram internal benchmarks; Smallest AI internal evaluation.*