Data read October 27, 2026
Korean TTS APIs in 2026: 8 models tested in Korean
8 models were tested in Korean by Artificial Analysis or Speko. 3 of the 8 are in the multilingual speed ranking; the others are not tagged multilingual by Coval or are not measured by it. The fastest ranked model tested in Korean is Inworld Realtime TTS-2.
No public source publishes naturalness or accuracy for Korean on its own, and all latency is measured in English from the US East. The page therefore says who was tested in Korean, and how fast each model is in general.
How the rows are ordered. Ranked models first, in ranking order (speed tier, then P95, ties by median); the 5 models without a rank follow alphabetically.
| Rank | Model | Speed tier From the Coval P95 | P95 (ms) 1 turn in 20 is slower | Languages tested | Listener Elo Artificial Analysis, with 95% interval | Price per 1M characters List price; a range when sources differ |
|---|---|---|---|---|---|---|
| 6 |  Inworld Realtime TTS-2 | Fast enough | 194.7 | 12 | 1,267 ±14 | $15 to $25 |
| 15 |  Cartesia Sonic 3.5 | Visible delay | 390.5 | 15 | 1,190 ±11 | $39.20 to $50 |
| 16 = |  Rime Coda | Visible delay | 428.1 | 1 | 1,054 ±12 | $50 |
| not ranked |  Amazon Polly Generative | n/a | n/a | 1 | 1,063 ±11 | $30 |
| not ranked |  ElevenLabs Eleven v3 Conversational | n/a | n/a | 13 | 1,213 ±12 | $50 |
| not ranked |  Google Gemini 3.1 Flash TTS | n/a | n/a | 9 | 1,212 ±11 | $18.30 to $33.30 |
| not ranked | | n/a | n/a | 4 | 1,126 ±11 | $100 |
| not ranked |  OpenAI GPT-4o mini TTS | n/a | n/a | 9 | n/a | $20 |
Frequently asked questions
- Which TTS APIs support Korean?
- 8 models were tested in Korean. Starting with the best-ranked, Inworld Realtime TTS-2, Cartesia Sonic 3.5, Rime Coda, and Amazon Polly Generative. Being tested in a language is evidence of support, not a quality score.
- Is TTS latency measured in Korean?
- No. Coval measures latency in English from the US East, so the latency columns show how fast each model starts in general, not in Korean.
- Which Korean TTS API is fastest?
- Among models tested in Korean that are also ranked, Inworld Realtime TTS-2 is first, with a P95 of 194.7 ms.
- How many of the 8 models are ranked?
- 3 of the 8 are in the multilingual speed ranking; the others are not tagged multilingual by Coval or are not measured by it.