Smallest.ai · Proprietary · Read 2026-10-27
Smallest.ai Lightning v3.1: latency, voice quality, price and languages
- Rank
- not ranked
- Speed tier
- n/a
- P95
- n/a
- Price / 1M chars
- $17.50 to $25
Smallest.ai Lightning v3.1 is a proprietary text-to-speech model from Smallest.ai. Coval does not measure its latency, so it has no speed tier and no rank. Artificial Analysis or Speko tested it in 4 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 | n/a |
| Median time to first audio | n/a |
| P90 | n/a |
| P95 | n/a |
| Mean | n/a |
| Standard deviation | n/a |
| Calls in the window | n/a |
| Cekura median, streamed text | 363 ms |
| Cekura median, full text | 357 ms |
Voice quality (never added together)
| Listener Elo (Artificial Analysis) | 1,020 ±12 |
| Customer-service Elo (Artificial Analysis) | 1,068 ±28 |
| Naturalness (Speko) | 1,544 |
| Naturalness estimate (Cekura, 1 to 5) | 4.49 |
Accuracy
| Reading accuracy (Cekura) | 81.3% |
| Numbers (Cekura) | 78% |
| Codes (Cekura) | 81% |
| Context (Cekura) | 75% |
| Medical terms (Cekura) | 97% |
| Hard passages judged correct (Artificial Analysis) | n/a |
| Numbers and dates (Speko score) | 0.25 |
| Word error rate (Coval) | n/a |
Price per 1 million characters
| Range across sources | $17.50 to $25 |
| Artificial Analysis | $25 |
| Speko | $17.50 |
| Coval | n/a |
| Cekura | $19.50 |
Coverage
| Access | Proprietary |
| Streaming | Measured |
| Coval tags | n/a |
| Rated for | Knowledge sharing, Assistants, Entertainment, Customer service |
| Languages tested | French, German, Hindi, Spanish |
Not collected
- Speed (Coval median time to first audio): not measured by Coval (reading of 2026-10-27, 30-day window)
- Speed (Coval P95 time to first audio): not measured by Coval (reading of 2026-10-27, 30-day window)
Sources
- https://artificialanalysis.ai/text-to-speech/leaderboard/provider-voice (read 2026-10-27)
- https://benchmarks.cekura.ai/text-to-speech (read 2026-10-27)
- https://benchmarks.speko.ai/tts/ (read 2026-10-27)
- Vendor site: https://smallest.ai/
Keep exploring
Frequently asked questions
- How fast is Smallest.ai Lightning v3.1?
- Coval does not measure Smallest.ai Lightning v3.1, so no latency is published here.
- How much does Smallest.ai Lightning v3.1 cost?
- The benchmarks print a list price of $17.50 to $25 per million characters for Smallest.ai Lightning v3.1.
- Which languages was Smallest.ai Lightning v3.1 tested in?
- Artificial Analysis or Speko tested Smallest.ai Lightning v3.1 in French, German, Hindi, Spanish.