Best TTS APIs 2026
Naturalness from our own blind human A/B study on phone-agent lines, first-audio latency measured from one US region, vendor list prices; latest capture 2026-11-06. Each axis below is ranked separately.
Most natural
Gemini gemini-3.1-flash-tts-preview tops naturalness at Elo 1591 from blind human A/B votes on phone-agent lines, with ElevenLabs eleven_v3_conversational at 1590 (2026-07-03). The two are a statistical tie; their win-rate intervals overlap. Speed splits them: eleven_v3_conversational reaches first audio in 266ms against 978ms for gemini-3.1-flash-tts-preview.
| Model | Naturalness Elo | Win % | First audio p50 | Cost / 1M chars |
|---|---|---|---|---|
| Gemini gemini-3.1-flash-tts-preview | 1591 | 66% | 978ms | $33.3 |
| ElevenLabs eleven_v3_conversational | 1590 | 66% | 266ms | $50.0 |
| Deepgram aura-2 | 1584 | 65% | 125ms | $30.0 |
| Cartesia sonic-3.5 | 1574 | 65% | 121ms | $50.0 |
| Speechify simba-3.2 | 1573 | 63% | 85ms | $10.0 |
Fastest first audio
Nari Qwen3-TTS Fast reaches first audio in 64ms at the median (2026-09-12), the fastest synthesis we measured; note its naturalness (1536) is an automated estimate, not a blind-panel score. Among panel-rated voices, Speechify simba-3.2 is fastest at 85ms with Elo 1573 at $10.0 per million characters.
| Model | First audio p50 | Naturalness | Cost / 1M chars |
|---|---|---|---|
| Nari Qwen3-TTS Fast | 64ms | 1536 | $10.0 |
| Palabra palabra-tts-v1 | 72ms | 1520 | $12.0 |
| Nari Qwen3-TTS | 75ms | 1510 | $5.0 |
| Inworld inworld-tts-2-flash | 82ms | 1501 | $15.0 |
| Speechify simba-3.2 | 85ms | 1573 | $10.0 |
Best multilingual
No voice wins every language. In our blind A/B listening studies (2026-07-21): ElevenLabs eleven_v3_conversational leads Spanish; Gemini gemini-3.1-flash-tts-preview leads Filipino. German, French, Arabic, Norwegian, Hindi, Tamil, Telugu, Chinese (Mandarin), Korean, Japanese, Thai, Lithuanian are statistical tie bands - the top intervals overlap, so no leader is declared; read the full columns before picking there.
| Language | Top system | Elo | 95% CI |
|---|---|---|---|
| Spanish | ElevenLabs eleven_v3_conversational | 1951 | 1859-2142 |
| Filipino | Gemini gemini-3.1-flash-tts-preview | 2012 | 1854-2289 |
Full per-language columns, voices and caveats: Multilingual TTS.
Best value
Out of Set Airy TTS lists at $3.67 per million characters and still sits in the board's top naturalness group at Elo 1416 (2026-10-20). Maya Maya 2 Native lists at $4.0 but rates Elo —: cheap and natural are different axes.
| Model | Cost / 1M chars | Naturalness | First audio p50 |
|---|---|---|---|
| Out of Set Airy TTS | $3.67 | 1416 | — |
| Maya Maya 2 Native | $4.0 | — | 100ms |
| Nari Qwen3-TTS | $5.0 | 1510 | 75ms |
| Hopper Qwen3-TTS | $5.67 | 1406 | — |
| Gemini gemini-3.8-flash-lite-tts | $10.0 | 1639 | 497ms |
How we measured
Method: how Speko benchmarks TTS. Full boards: Text-to-Speech, Multilingual TTS, and the raw dataset at /data.json.