Soniox · Proprietary · Read 2026-10-27
Soniox TTS RT v1: latency, voice quality, price and languages
- Rank
- 10 (tied) / 23
- Speed tier
- Visible delay
- P95
- 319.0 ms
- Price / 1M chars
- $13 to $14.10
Soniox TTS RT v1 is a proprietary text-to-speech model from Soniox. Coval measures a median of 258.3 ms and a P95 of 319.0 ms to first audio, which puts it in the Visible delay speed tier, rank 10 (tied) of 23 in the multilingual ranking. Artificial Analysis or Speko tested it in 3 languages.
This summary is generated from the measures below; it is not a vendor description. Measures a source does not hold are shown as n/a and are never estimated.
Speed (Coval, 30 days, US East, English)
| Speed tier | Visible delay |
| Median time to first audio | 258.3 ms |
| P90 | 307.0 ms |
| P95 | 319.0 ms |
| Mean | 256.4 ms |
| Standard deviation | 42.9 ms |
| Calls in the window | 2,372 |
| Cekura median, streamed text | n/a |
| Cekura median, full text | n/a |
Voice quality (never added together)
| Listener Elo (Artificial Analysis) | n/a |
| Customer-service Elo (Artificial Analysis) | n/a |
| Naturalness (Speko) | 1,569 |
| Naturalness estimate (Cekura, 1 to 5) | n/a |
Accuracy
| Reading accuracy (Cekura) | n/a |
| Numbers (Cekura) | n/a |
| Codes (Cekura) | n/a |
| Context (Cekura) | n/a |
| Medical terms (Cekura) | n/a |
| Hard passages judged correct (Artificial Analysis) | n/a |
| Numbers and dates (Speko score) | 0.35 |
| Word error rate (Coval) | 2.6% |
Price per 1 million characters
| Range across sources | $13 to $14.10 |
| Artificial Analysis | n/a |
| Speko | $13 |
| Coval | $14.10 |
| Cekura | n/a |
Coverage
| Access | Proprietary |
| Streaming | Measured |
| Coval tags | multilingual, voice-cloning |
| Rated for | n/a |
| Languages tested | French, German, Spanish |
Not collected
- Listener rating (Artificial Analysis Speech Arena Elo): not measured by Artificial Analysis (reading of 2026-10-27)
- Price (Artificial Analysis price per 1M characters): not measured by Artificial Analysis (reading of 2026-10-27)
Sources
- https://benchmarks-api-6wxgp27p2a-ue.a.run.app/v1/results/aggregates?benchmark=TTS&window=30d&include_series=false (read 2026-10-27)
- https://benchmarks.speko.ai/tts/ (read 2026-10-27)
- Vendor site: https://soniox.com/
Keep exploring
Frequently asked questions
- How fast is Soniox TTS RT v1?
- Coval measures a median time to first audio of 258.3 ms and a P95 of 319.0 ms for Soniox TTS RT v1, over 30 days from the US East in English (Visible delay tier).
- How much does Soniox TTS RT v1 cost?
- The benchmarks print a list price of $13 to $14.10 per million characters for Soniox TTS RT v1.
- Which languages was Soniox TTS RT v1 tested in?
- Artificial Analysis or Speko tested Soniox TTS RT v1 in French, German, Spanish.