Smallest.ai · read on October 27, 2026
Smallest.ai Lightning V3.1 Pro (Jul 2026)
Smallest.ai Lightning V3.1 Pro (Jul 2026) is a TTS (text-to-speech) model from Smallest.ai. Coval measures its P95 time to first audio at 703.3 ms, which puts it in the Visible delay speed tier. It ranks 27 of 86 in the full ranking.
- Speed tier
- Visible delay
- P95 / median
- 703.3 ms / 360.5 ms
- Listener Elo
- 1,169
- Price per 1M chars
- $19.5
Where it ranks
Full ranking: 27 of 86. Use case ranks, by speed:
The tier and the ranks are computed by this site from the benchmarks' figures, not declared by Smallest.ai.
Measurements and sources
Coval
| Median time to first audio (P50) | 360.5 ms |
| Time to first audio, P95 | 703.3 ms |
| Time to first audio, mean | 397 ms |
| Time to first audio, P90 | 586 ms |
| Timed requests | 2,797 |
Speko
| Naturalness score | 1,447 |
| Latency, board chart | 839 ms |
Artificial Analysis
| Listener Elo | 1,169 |
| Listener Elo, 95% interval | 12 |
| Listener Elo, customer service | 1,189 |
| Hard passages pronounced correctly | 72.1% |
Details
| Provider | Smallest.ai |
| Access | Proprietary |
| Streaming | A benchmark measures its time to first audio |
| Features listed by Coval | multilingual, voice-cloning |
| Languages tested | Not collected: no benchmark here lists languages for this model |
| Measured by | Artificial Analysis, Coval, Speko |
| Official site | smallest.ai |
Not collected
Nothing below is estimated. Each line says which measure is missing and why.
- Numbers and dates (Speko pronunciation score): listed by Speko without this value (reading of 2026-10-27)
Sources
- https://artificialanalysis.ai/text-to-speech (read on October 27, 2026)
- https://artificialanalysis.ai/text-to-speech/leaderboard/provider-voice (read on October 27, 2026)
- https://benchmarks-api-6wxgp27p2a-ue.a.run.app/v1/results/aggregates?benchmark=TTS&window=30d&include_series=false (read on October 27, 2026)
- https://benchmarks.speko.ai/tts/ (read on October 27, 2026)
Values are copied from these pages on the date shown. The match between this model and its benchmark entries is inferred, because a source writes the name differently: Coval: “Smallest Lightning v3.1 Pro”; Speko: “Smallest lightning_v3.1_pro”. See the methodology.
Compare it with the reference model: Gradium TTS vs Smallest.ai Lightning V3.1 Pro (Jul 2026).