CartesiaElevenLabsAudio matchupSpeech output
Sonic 3.6vs.Eleven v4 Turbo
Which model is better?
Eleven v4 Turbo does better in independent tests, while Sonic 3.6 is more popular.
Pick Sonic 3.6 for
Pick Eleven v4 Turbo 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 v4 Turbo slightly aheadEleven v4 Turbo is clearly ahead in 0 of 12 subtests and slightly in 9, Sonic 3.6 in 0 clearly and slightly in 2. 1 is level.
Coval TTFA roundtrip component maximum
lower is better, as of November 5, 2026
Coval Time to First Audio (TTFA) maximum
lower is better, as of November 5, 2026
Coval TTFA leading silence p50
lower is better, as of November 5, 2026
Show all 12 subtests
| Subtest | Sonic 3.6 | Eleven v4 Turbo | Verdict |
|---|---|---|---|
| Coval TTFA roundtrip component maximum (lower is better) | 2,932 ms | 791 ms | Eleven v4 Turbo slightly ahead |
| Coval Time to First Audio (TTFA) maximum (lower is better) | 3,066 ms | 833 ms | Eleven v4 Turbo slightly ahead |
| Coval TTFA leading silence p50 (lower is better) | 137 ms | 61 ms | Eleven v4 Turbo slightly ahead |
| Coval TTFA leading silence mean (lower is better) | 135 ms | 60 ms | Eleven v4 Turbo slightly ahead |
| Coval TTFA leading silence maximum (lower is better) | 245 ms | 138 ms | Eleven v4 Turbo slightly ahead |
| Coval Time to First Audio (TTFA) p50 (lower is better) | 279 ms | 188 ms | Eleven v4 Turbo slightly ahead |
| Coval Time to First Audio (TTFA) mean (lower is better) | 286 ms | 193 ms | Eleven v4 Turbo slightly ahead |
| Coval Word Error Rate (WER) per-sample maximum (lower is better) | 43.8 % | 62.5 % | Sonic 3.6 slightly ahead |
| Coval TTFA roundtrip component p50 (lower is better) | 144 ms | 124 ms | Eleven v4 Turbo slightly ahead |
| Coval TTFA roundtrip component mean (lower is better) | 151 ms | 132 ms | Eleven v4 Turbo slightly ahead |
| Coval pooled corpus Word Error Rate (WER) (lower is better) | 1.5 % | 1.7 % | Sonic 3.6 slightly ahead |
| Coval Word Error Rate (WER) per-sample p50 (lower is better) | 0.0 % | 0.0 % | level |
Source · latest November 5, 2026
Artificial Analysis
Eleven v4 Turbo aheadEleven v4 Turbo is clearly ahead in 1 of 2 subtests, Sonic 3.6 in none. 1 is level.
Artificial Analysis Provider Voice Arena preference
95 % ranges 1,280 to 1,306 and 1,315 to 1,347, as of November 3, 2026
Artificial Analysis Controlled Voice Arena Elo
95 % ranges 1,135 to 1,159 and 1,141 to 1,165, as of November 3, 2026
Source · latest November 3, 2026
DesignArena
Sonic 3.6 slightly aheadDesignArena Audio Realism Elo
as of October 28, 2026
Source · latest October 28, 2026
All data side by side
Prices are verbatim from the provider, because audio models bill per minute, character or token.
| Sonic 3.6 | Eleven v4 Turbo | |
|---|---|---|
| Task | Speech output | Speech output |
| Developer | Cartesia | ElevenLabs |
| Status | Active | Active |
| Released | n/a | September 28, 2026 |
| Weights | proprietary | n/a |
| Runs locally | no | no |
| Popularity (out of 100) | 39 | 0 |