364.1 ms P50 time-to-first-audio on Coval; ranked 26th of 112 in the TTS for Voice Agents 2026 index.
Benchmark summary: 28.7/100, ranked 26th of 112 in the TTS for Voice Agents 2026 index (Listed). Strongest criterion: price, 1.8 of 5 points.
Fish Audio OpenAudio S1 is a proprietary text-to-speech (TTS) API from Fish Audio, measured by two independent benchmarks: Artificial Analysis and Coval.
Overall score
28.7 /100
Data checked on September 30, 2026
Updated after each benchmark capture
Every point comes from a public benchmark: sources · methodology
Fish Audio OpenAudio S1 ranks 26th of 112 in the 2026 text-to-speech (TTS) API benchmark, with a score of 28.7/100.
On Coval's 30-day window ending October 1, 2026 (11,849 runs), Fish Audio OpenAudio S1 has a P50 (median) time-to-first-audio (TTFA) of 364.1 ms, 23rd lowest of the 31 models Coval measures. Its P99, the slowest 1% of turns, is 789.6 ms (20th lowest of the 31 models Coval measures). Latency consistency: a standard deviation of 163.5 ms (20th lowest of the 31 models Coval measures). Mean time to first byte (TTFB) is 265.7 ms.
Coval measures an accuracy (word error rate) of 4.8% over 11,829 samples on the same window, 13th lowest of the 31 models Coval measures.
In the Artificial Analysis Speech Arena (capture of October 1, 2026), Fish Audio OpenAudio S1 has an Elo of 1,078 (±11, 95% confidence) from 4,442 blind comparisons, 43rd highest of the 92 models Artificial Analysis rates.
Artificial Analysis lists Fish Audio OpenAudio S1 at $15 per 1M characters (19th lowest of the 78 models Artificial Analysis lists a price for).
Artificial Analysis changed its Speech Arena Elo between the captures of September 30, 2026 and October 1, 2026 without a new measurement date (1,080, then 1,078): the score uses the average, 1,079. The value shown is the latest.
Tested in Spanish, German, French, Portuguese, Japanese, Chinese and Arabic by Artificial Analysis or Speko. A language missing here was not tested, which does not mean it is unsupported.
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