ElevenLabsFish AudioAudio matchupSpeech output
Eleven Flash v2.5vs.Fish Audio S2.1 Pro
Which model is better?
Fish Audio S2.1 Pro does better in independent tests, while Eleven Flash v2.5 is more popular.
Pick Eleven Flash v2.5 for
Pick Fish Audio S2.1 Pro for
Shared tests
Independent evaluators and leaderboards only, the newest shared snapshot per evaluator. With 95 % ranges a lead counts when they do not overlap; for hit rates, when it holds in a 95 % test. Without any uncertainty figure at most “slightly ahead”.
Coval
Eleven Flash v2.5 slightly aheadEleven Flash v2.5 is clearly ahead in 0 of 16 subtests and slightly in 10, Fish Audio S2.1 Pro in 0 clearly and slightly in 5. 1 is level.
Coval TTFA leading silence p50
lower is better, as of November 6, 2026
Coval TTFA roundtrip component maximum
lower is better, as of November 6, 2026
Coval Time to First Audio (TTFA) maximum
lower is better, as of November 6, 2026
Show all 16 subtests
| Subtest | Eleven Flash v2.5 | Fish Audio S2.1 Pro | Verdict |
|---|---|---|---|
| Coval TTFA leading silence p50 (lower is better) | 42 ms | 4 ms | Fish Audio S2.1 Pro slightly ahead |
| Coval TTFA roundtrip component maximum (lower is better) | 517 ms | 1,740 ms | Eleven Flash v2.5 slightly ahead |
| Coval Time to First Audio (TTFA) maximum (lower is better) | 555 ms | 1,825 ms | Eleven Flash v2.5 slightly ahead |
| Coval TTFA leading silence mean (lower is better) | 42 ms | 15 ms | Fish Audio S2.1 Pro slightly ahead |
| Coval TTFA roundtrip component p50 (lower is better) | 151 ms | 333 ms | Eleven Flash v2.5 slightly ahead |
| Coval TTFA roundtrip component mean (lower is better) | 162 ms | 356 ms | Eleven Flash v2.5 slightly ahead |
| Coval TTFA roundtrip component p95 (lower is better) | 236 ms | 511 ms | Eleven Flash v2.5 slightly ahead |
| Coval Time to First Audio (TTFA) p95 (lower is better) | 279 ms | 531 ms | Eleven Flash v2.5 slightly ahead |
| Coval Time to First Audio (TTFA) mean (lower is better) | 204 ms | 371 ms | Eleven Flash v2.5 slightly ahead |
| Coval Time to First Audio (TTFA) p50 (lower is better) | 197 ms | 346 ms | Eleven Flash v2.5 slightly ahead |
| Coval Word Error Rate (WER) per-sample maximum (lower is better) | 75.0 % | 50.0 % | Fish Audio S2.1 Pro slightly ahead |
| Coval Word Error Rate (WER) per-sample p95 (lower is better) | 16.0 % | 12.5 % | Fish Audio S2.1 Pro slightly ahead |
| Coval TTFA leading silence maximum (lower is better) | 116 ms | 143 ms | Eleven Flash v2.5 slightly ahead |
| Coval pooled corpus Word Error Rate (WER) (lower is better) | 1.9 % | 1.6 % | Fish Audio S2.1 Pro slightly ahead |
| Coval TTFA leading silence p95 (lower is better) | 67 ms | 73 ms | Eleven Flash v2.5 slightly ahead |
| Coval Word Error Rate (WER) per-sample p50 (lower is better) | 0.0 % | 0.0 % | level |
Source · latest November 6, 2026
Artificial Analysis
Fish Audio S2.1 Pro aheadFish Audio S2.1 Pro is clearly ahead in 1 of 2 subtests, Eleven Flash v2.5 in none. 1 is level.
Artificial Analysis Provider Voice Arena preference
95 % ranges 1,065 to 1,085 and 1,170 to 1,196, as of November 3, 2026
Artificial Analysis Controlled Voice Arena Elo
95 % ranges 976 to 1,000 and 996 to 1,022, as of November 3, 2026
Source · latest November 3, 2026
All data side by side
Prices are verbatim from the provider, because audio models bill per minute, character or token.
| Eleven Flash v2.5 | Fish Audio S2.1 Pro | |
|---|---|---|
| Task | Speech output | Speech output |
| Developer | ElevenLabs | Fish Audio |
| Status | Active | Active |
| Released | n/a | June 23, 2026 |
| Weights | proprietary | proprietary |
| Runs locally | no | no |
| Price | n/a | Free through 2026-11-30 under fair-use rules; changes with advance notice |
| Popularity (out of 100) | 22 | 0 |