Language tested · read on October 27, 2026
Text-to-speech models tested in Japanese
28 of the 96 text-to-speech (TTS) models in this index are filed under Japanese , led by Inworld Realtime TTS-2 Flash, Inworld Realtime TTS-2 and ElevenLabs Eleven v4 Turbo. Same order and same measures as the full ranking.
| Rank | Model | Speed tier | P95 | Speed (shorter is faster) | Median | Listener Elo | Price per 1M chars | Best for |
|---|---|---|---|---|---|---|---|---|
| 3 |  Inworld Realtime TTS-2 FlashInworld | Headroom | 100.9 ms | 58.1 ms | 1,218 | $10.4 to $15 | Customer service, Voice agents, Assistants, Entertainment, Knowledge sharing | |
| 8 |  Inworld Realtime TTS-2Inworld | Fast enough | 194.7 ms | 149.1 ms | 1,267 | $15 to $25 | Customer service, Voice agents, Assistants, Entertainment, Knowledge sharing | |
| 11 |  ElevenLabs Eleven v4 TurboElevenLabs | Fast enough | 238.6 ms | 188.9 ms | 1,333 | $40 | Customer service, Voice agents, Assistants, Entertainment, Knowledge sharing | |
| 12 |  ElevenLabs Flash v2.5ElevenLabs | Fast enough | 255.1 ms | 191 ms | 1,076 | $40 to $50 | Customer service, Voice agents, Assistants, Entertainment, Knowledge sharing | |
| 15 |  Soniox TTS Real-Time v2Soniox | Visible delay | 324.7 ms | 264.4 ms | 1,180 | $13 to $14.81 | Customer service, Assistants, Entertainment, Knowledge sharing | |
| 18 |  Cartesia Sonic 3.6Cartesia | Visible delay | 374.4 ms | 285.8 ms | 1,292 | $39.2 to $50 | Customer service, Assistants, Entertainment, Knowledge sharing | |
| 19 |  Cartesia Sonic 3.5Cartesia | Visible delay | 390.5 ms | 279.3 ms | 1,190 | $39.2 to $50 | Customer service, Assistants, Entertainment, Knowledge sharing | |
| 23 |  SpaceXAI Grok TTSxAI | Visible delay | 473.9 ms | 329.8 ms | 1,155 | $15 | Customer service, Assistants, Entertainment, Knowledge sharing | |
| 29 |  Google Chirp 3: HDGoogle | Visible delay | 917.2 ms | 534.1 ms | 1,061 | $30 | Customer service, Assistants, Entertainment, Knowledge sharing | |
| 32 (tie) |  ElevenLabs Eleven v4ElevenLabs | No tier | Not timed | Not timed | Not timed | 1,333 | $80 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 33 |  Google Gemini 3.8 Flash TTSGoogle | No tier | Not timed | Not timed | Not timed | 1,280 | $15 to $16.5 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 34 (tie) |  Alibaba Qwen-Audio-3.0-TTS-PlusAlibaba (Qwen) | No tier | Not timed | Not timed | Not timed | 1,269 | $19.3 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 34 (tie) |  Google Gemini 3.8 Flash-Lite TTSGoogle | No tier | Not timed | Not timed | Not timed | 1,256 | $10 to $11 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 37 (tie) |  ElevenLabs Eleven v3 ConversationalElevenLabs | No tier | Not timed | Not timed | Not timed | 1,213 | $50 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 37 (tie) |  Google Gemini 3.1 Flash TTSGoogle | No tier | Not timed | Not timed | Not timed | 1,212 | $18.3 to $33.3 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 42 (tie) |  ElevenLabs Eleven v3ElevenLabs | No tier | Not timed | Not timed | Not timed | 1,184 | $100 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 42 (tie) | | No tier | Not timed | Not timed | Not timed | 1,174 | $100 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 44 (tie) | | No tier | Not timed | Not timed | Not timed | 1,153 | $60 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 46 (tie) | | No tier | Not timed | Not timed | Not timed | 1,126 | $100 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 49 (tie) |  Fish Audio S2 ProFish Audio | No tier | Not timed | Not timed | Not timed | 1,108 | $15 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 52 (tie) |  ElevenLabs Multilingual v2ElevenLabs | No tier | Not timed | Not timed | Not timed | 1,093 | $100 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 52 (tie) |  ElevenLabs Turbo v2.5ElevenLabs | No tier | Not timed | Not timed | Not timed | 1,093 | $50 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 54 |  Fish Audio OpenAudio S1Fish Audio | No tier | Not timed | Not timed | Not timed | 1,084 | $15 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 62 (tie) | | No tier | Not timed | Not timed | Not timed | 1,056 | $87.5 to $100 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 62 (tie) |  Cartesia Sonic 3Cartesia | No tier | Not timed | Not timed | Not timed | 1,054 | $49 to $50 | Customer service, Assistants, Entertainment, Knowledge sharing |
| 62 (tie) |  Fish Audio OpenAudio S1 MiniFish Audio | No tier | Not timed | Not timed | Not timed | 1,043 | $15 | Knowledge sharing |
| 63 (tie) |  Boson AI Higgs Audio V3 TTSBoson AI | No tier | Not timed | Not timed | Not timed | 1,045 | $15 | Customer service, Assistants, Entertainment, Knowledge sharing |
| Unranked |  OpenAI GPT-4o mini TTSOpenAI | No tier | Not timed | Not timed | Not timed | Not rated | $20 | Not rated |
Frequently asked questions
- Which Japanese TTS model is the fastest?
- Inworld Realtime TTS-2 Flash, with a P95 time to first audio of 100.9 ms in Coval's 30-day window. Of the 28 models on this page, 9 are timed.
- How are these models ordered?
- As in the full ranking: speed tier, then P95 time to first audio, with ties within 10 ms ordered by median time to first audio. Models Coval does not time follow, ordered by listener Elo; models with neither measure come last, in alphabetical order.