Fish Audio · Proprietary · Read 2026-10-27
Fish Audio S2.1 Pro Free: latency, voice quality, price and languages
- Rank
- 23 / 23
- Speed tier
- Visible delay
- P95
- 1,137.9 ms
- Price / 1M chars
- n/a
Fish Audio S2.1 Pro Free is a proprietary text-to-speech model from Fish Audio. Coval measures a median of 793.8 ms and a P95 of 1,137.9 ms to first audio, which puts it in the Visible delay speed tier, rank 23 of 23 in the multilingual ranking. No source tested it in a language other than English.
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 | 793.8 ms |
| P90 | 1,011.4 ms |
| P95 | 1,137.9 ms |
| Mean | 826.9 ms |
| Standard deviation | 327.6 ms |
| Calls in the window | 2,792 |
| Cekura median, streamed text | n/a |
| Cekura median, full text | n/a |
Voice quality (never added together)
| Listener Elo (Artificial Analysis) | n/a |
| Customer-service Elo (Artificial Analysis) | n/a |
| Naturalness (Speko) | n/a |
| Naturalness estimate (Cekura, 1 to 5) | n/a |
Accuracy
| Reading accuracy (Cekura) | n/a |
| Numbers (Cekura) | n/a |
| Codes (Cekura) | n/a |
| Context (Cekura) | n/a |
| Medical terms (Cekura) | n/a |
| Hard passages judged correct (Artificial Analysis) | n/a |
| Numbers and dates (Speko score) | n/a |
| Word error rate (Coval) | 1.6% |
Price per 1 million characters
| Range across sources | n/a |
| Artificial Analysis | n/a |
| Speko | n/a |
| Coval | n/a |
| Cekura | n/a |
Coverage
| Access | Proprietary |
| Streaming | Measured |
| Coval tags | emotion-control, multilingual, voice-cloning |
| Rated for | n/a |
| Languages tested | none beyond English |
Not collected
- Naturalness (Speko naturalness): not measured by Speko (reading of 2026-10-27)
- Listener rating (Artificial Analysis Speech Arena Elo): not measured by Artificial Analysis (reading of 2026-10-27)
- Numbers and dates (Speko pronunciation score): not measured by Speko (reading of 2026-10-27)
- Price (Artificial Analysis price per 1M characters): not measured by Artificial Analysis (reading of 2026-10-27)
Sources
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Frequently asked questions
- How fast is Fish Audio S2.1 Pro Free?
- Coval measures a median time to first audio of 793.8 ms and a P95 of 1,137.9 ms for Fish Audio S2.1 Pro Free, over 30 days from the US East in English (Visible delay tier).
- How much does Fish Audio S2.1 Pro Free cost?
- No benchmark prints a list price for Fish Audio S2.1 Pro Free.
- Which languages was Fish Audio S2.1 Pro Free tested in?
- No source tested Fish Audio S2.1 Pro Free in a language other than English.