Speech Arena Elo 1,117 on Artificial Analysis, latency not measured; ranked 50th (tied) of 112 in the TTS for Voice Agents 2026 index.
Benchmark summary: 8.6/100, ranked 50th (tied) of 112 in the TTS for Voice Agents 2026 index (Listed). Strongest criterion: price, 1.8 of 5 points.
Fish Audio S2 Pro is an open-weights text-to-speech (TTS) API from Fish Audio, measured by one independent benchmark, Artificial Analysis.
Overall score
8.6 /100
Data checked on September 30, 2026
Updated after each benchmark capture
Every point comes from a public benchmark: sources · methodology
Fish Audio S2 Pro ranks 50th of 112 in the 2026 text-to-speech (TTS) API benchmark, with a score of 8.6/100.
Neither Coval nor Speko measures Fish Audio S2 Pro's latency, so it scores 0 of 60 on real-time speed and does not appear in the real-time ranking.
No accuracy measurement: Coval does not measure its word error rate and Speko does not rate its pronunciation robustness, so accuracy counts 0 of 15.
In the Artificial Analysis Speech Arena (capture of October 1, 2026), Fish Audio S2 Pro has an Elo of 1,117 (±12, 95% confidence) from 2,325 blind comparisons, 31st highest of the 92 models Artificial Analysis rates.
Artificial Analysis lists Fish Audio S2 Pro 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 (1,118, then 1,117): the score uses the average, 1,117.5. The value shown is the latest.
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.
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