ElevenLabs Eleven v4 Turbo ElevenLabs · text-to-speech (TTS) API

Speed

On Coval's 30-day window ending October 22, 2026 (1,986 runs from US East), ElevenLabs Eleven v4 Turbo starts speaking after 189.9 ms on a typical turn (median) and 243.7 ms on a slow turn (P95, the slowest one in twenty). That P95 is 12th lowest of the 32 models Coval measures, which puts it in the Fast enough tier: fast enough for most agents. On the median it is a tie (gap under 10 ms) with Deepgram Flux TTS and ElevenLabs Flash v2.5. Speko's board plots it at 203 ms time to first audio from US East; its model page reports a 205 ms sweep.

Voice quality

Speko rates its naturalness at 1,670 Elo from blind A/B votes on phone-agent lines (2nd highest of the 43 models Speko rates). In the Artificial Analysis Speech Arena it holds 1,335 ±17 Elo (95% interval), the highest of the 98 models Artificial Analysis rates; scores whose intervals overlap are a tie. In its Customer Service category, Artificial Analysis places it 1st, at 1,379 Elo.

Numbers and dates

Speko's pronunciation test on numbers, dates and currency scores it 0.9 on a 0-to-1 scale (the 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

Coval lists $40 per 1M characters (since Oct 1, 2026). Artificial Analysis lists $40. Speko lists about $40. List prices, as each source prints them.

Languages tested

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