Fish Audio · Proprietary · Read 2026-10-27
Fish Audio S2.1 Pro: latency, voice quality, price and languages
- Rank
- 19 / 23
- Speed tier
- Visible delay
- P95
- 533.0 ms
- Price / 1M chars
- $15
Fish Audio S2.1 Pro is a proprietary text-to-speech model from Fish Audio. Coval measures a median of 328.1 ms and a P95 of 533.0 ms to first audio, which puts it in the Visible delay speed tier, rank 19 of 23 in the multilingual ranking. Artificial Analysis or Speko tested it in 2 languages.
This summary is generated from the measures below; it is not a vendor description. Measures a source does not hold are shown as n/a and are never estimated.
Speed (Coval, 30 days, US East, English)
| Speed tier | Visible delay |
| Median time to first audio | 328.1 ms |
| P90 | 445.6 ms |
| P95 | 533.0 ms |
| Mean | 355.7 ms |
| Standard deviation | 108.3 ms |
| Calls in the window | 2,806 |
| Cekura median, streamed text | 321 ms |
| Cekura median, full text | 333 ms |
Voice quality (never added together)
| Listener Elo (Artificial Analysis) | 1,184 ±13 |
| Customer-service Elo (Artificial Analysis) | 1,213 ±27 |
| Naturalness (Speko) | n/a |
| Naturalness estimate (Cekura, 1 to 5) | 4.40 |
Accuracy
| Reading accuracy (Cekura) | 92.0% |
| Numbers (Cekura) | 90% |
| Codes (Cekura) | 86% |
| Context (Cekura) | 100% |
| Medical terms (Cekura) | 100% |
| Hard passages judged correct (Artificial Analysis) | 88.1% |
| Numbers and dates (Speko score) | n/a |
| Word error rate (Coval) | 1.6% |
Price per 1 million characters
| Range across sources | $15 |
| Artificial Analysis | $15 |
| Speko | n/a |
| Coval | n/a |
| Cekura | $15 |
Coverage
| Access | Proprietary |
| Streaming | Measured |
| Coval tags | emotion-control, multilingual, voice-cloning |
| Rated for | Knowledge sharing, Assistants, Entertainment, Customer service |
| Languages tested | Chinese, German |
Not collected
- Naturalness (Speko naturalness): listed by Speko without this value (reading of 2026-10-27)
- Numbers and dates (Speko pronunciation score): listed by Speko without this value (reading of 2026-10-27)
Sources
- https://artificialanalysis.ai/text-to-speech (read 2026-10-27)
- https://artificialanalysis.ai/text-to-speech/leaderboard/provider-voice (read 2026-10-27)
- https://benchmarks.cekura.ai/text-to-speech (read 2026-10-27)
- https://benchmarks-api-6wxgp27p2a-ue.a.run.app/v1/results/aggregates?benchmark=TTS&window=30d&include_series=false (read 2026-10-27)
- https://benchmarks.speko.ai/tts/ (read 2026-10-27)
- Vendor site: https://fish.audio/
Keep exploring
Frequently asked questions
- How fast is Fish Audio S2.1 Pro?
- Coval measures a median time to first audio of 328.1 ms and a P95 of 533.0 ms for Fish Audio S2.1 Pro, over 30 days from the US East in English (Visible delay tier).
- How much does Fish Audio S2.1 Pro cost?
- The benchmarks print a list price of $15 per million characters for Fish Audio S2.1 Pro.
- Which languages was Fish Audio S2.1 Pro tested in?
- Artificial Analysis or Speko tested Fish Audio S2.1 Pro in Chinese, German.