Fish Audio S2.1 Pro Free
Listed Proprietary · Fish Audio
6.1
/100
Fish Audio S2.1 Pro Free is a proprietary text-to-speech (TTS) API from Fish Audio, measured by one independent benchmark, Coval.
Coval
StepFun Step Audio EditX (Mar 2026) StepFun · text-to-speech (TTS) API
ListedSpeech Arena Elo 1,092 on Artificial Analysis, latency not measured; ranked 68th of 112 in the TTS for Voice Agents 2026 index.
Benchmark summary: 6/100, ranked 68th of 112 in the TTS for Voice Agents 2026 index (Listed). Strongest criterion: voice quality, 6 of 20 points.
StepFun Step Audio EditX (Mar 2026) is an open-weights text-to-speech (TTS) API from StepFun, measured by one independent benchmark, Artificial Analysis.
Overall score
6 /100
Score breakdown
- Real-time speed 0 /60
- Voice quality 6 /20
- Accuracy 0 /15
- Price 0 /5
Data checked on September 30, 2026
Updated after each benchmark capture
Every point comes from a public benchmark: sources · methodology
StepFun Step Audio EditX (Mar 2026) ranks 68th of 112 in the 2026 text-to-speech (TTS) API benchmark, with a score of 6/100.
Real-time latency
Neither Coval nor Speko measures StepFun Step Audio EditX (Mar 2026)'s latency, so it scores 0 of 60 on real-time speed and does not appear in the real-time ranking.
Accuracy (word error rate)
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.
Voice quality
In the Artificial Analysis Speech Arena (capture of October 1, 2026), StepFun Step Audio EditX (Mar 2026) has an Elo of 1,092 (±13, 95% confidence) from 2,012 blind comparisons, 37th highest of the 92 models Artificial Analysis rates.
Price
No price is published by Artificial Analysis or Speko for this model; price counts 0 of 5.
Scoring note
Artificial Analysis changed its Speech Arena Elo between the captures of September 30, 2026 and October 1, 2026 without a new measurement date (1,093, then 1,092): the score uses the average, 1,092.5. The value shown is the latest.
Benchmark measurements
Artificial Analysis Speech Arena
- Speech Arena Elo (blind listener preference)
- 1,092
- Elo 95% interval (±)
- 13
- Arena rank
- 37
- Arena rank range
- 33-42
- Arena appearances
- 2,012
- Voices tested
- 2
- Released
- Feb 2026
- Artificial Analysis model
- Step Audio EditX (Mar 2026)
- Artificial Analysis leaderboard
- artificialanalysis.ai
Not collected
- Speed (Coval time to first audio) — not measured by Coval (capture of 2026-10-01, 30-day window); counts 0
- Speed (Speko time to first audio) — not measured by Speko (capture of 2026-10-01); counts 0
- Quality (Speko naturalness) — not measured by Speko (capture of 2026-10-01); counts 0
- Accuracy (Coval word error rate) — not measured by Coval (capture of 2026-10-01, 30-day window); counts 0
- Accuracy (Speko robustness) — not measured by Speko (capture of 2026-10-01); counts 0
- Price (Artificial Analysis price per 1M characters) — listed by Artificial Analysis without this value (capture of 2026-10-01); counts 0
- Price (Speko cost per 1M characters) — not measured by Speko (capture of 2026-10-01); counts 0
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