Smallest.ai Lightning v3.1 Smallest.ai · text-to-speech (TTS) API

Speed

Speko's board plots it at 648 ms time to first audio from US East; its model page reports a 173 ms sweep.

Voice quality

Speko rates its naturalness at 1,544 Elo from blind A/B votes on phone-agent lines (18th highest of the 43 models Speko rates). In the Artificial Analysis Speech Arena it holds 1,022 ±12 Elo (95% interval), 79th highest of the 98 models Artificial Analysis rates; scores whose intervals overlap are a tie. In its Customer Service category, Artificial Analysis places it 71st, at 1,061 Elo.

Numbers and dates

Speko's pronunciation test on numbers, dates and currency scores it 0.25 on a 0-to-1 scale (19th highest of the 30 models Speko scores). This is the accuracy measure used here; Coval's word error rate separates models too little to compare them.

Price

Artificial Analysis lists $25. Speko lists about $17.5. List prices, as each source prints them: a range of $17.5 to $25.

Languages tested

Tested in Spanish, German, French and Hindi by Artificial Analysis or Speko. A language missing here was not tested, which does not mean it is unsupported.