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Data read October 27, 2026

TTS APIs rated for assistants in 2026: 69 models

69 models have models rated for assistants. 15 of the 69 are in the multilingual speed ranking; the others are not tagged multilingual by Coval or are not measured by it.

Artificial Analysis assigns these use-case categories; the site does not decide them.

How the rows are ordered. Ranked models first, in ranking order (speed tier, then P95, ties by median); the 54 models without a rank follow alphabetically.

TTS APIs rated for assistants in 2026: 69 models
Rank Model Provider Speed tier From the Coval P95 P95 (ms) 1 turn in 20 is slower Listener Elo Artificial Analysis, with 95% interval Price per 1M characters List price; a range when sources differ
1 = Gradium TTS GradiumHeadroom104.31,174 ±13$36 to $57.80
1 = Inworld Realtime TTS-2 Flash InworldHeadroom100.91,218 ±13$10.40 to $15
5 SpeechifyAI Simba 3.0 SpeechifyFast enough149.41,116 ±11$6.60 to $10
6 Inworld Realtime TTS-2 InworldFast enough194.71,267 ±14$15 to $25
8 ElevenLabs Eleven v4 Turbo ElevenLabsFast enough238.61,333 ±16$40
9 ElevenLabs Flash v2.5 ElevenLabsFast enough255.11,076 ±11$40 to $50
10 = Soniox TTS Real-Time v2 SonioxVisible delay324.71,180 ±11$13 to $14.81
12 = Murf AI Falcon 2 Murf AIVisible delay363.51,154 ±12$10
14 Cartesia Sonic 3.6 CartesiaVisible delay374.41,292 ±14$39.20 to $50
15 Cartesia Sonic 3.5 CartesiaVisible delay390.51,190 ±11$39.20 to $50
16 = Rime Coda RimeVisible delay428.11,054 ±12$50
18 SpaceXAI Grok TTS xAIVisible delay473.91,155 ±13$15
19 Fish Audio S2.1 Pro Fish AudioVisible delay533.01,184 ±13$15
20 Smallest.ai Lightning V3.1 Pro (Jul 2026) Smallest.aiVisible delay703.31,169 ±12$19.50
22 Google Chirp 3: HD GoogleVisible delay917.21,061 ±12$30
not ranked Alibaba Qwen-Audio-3.0-TTS-Plus Alibaba (Qwen)n/an/a1,269 ±13$19.30
not ranked Alibaba Qwen-Audio-3.1-TTS-Plus Alibaba (Qwen)n/an/a1,306 ±15$19.30
not ranked Alibaba Qwen3 TTS Alibaba (Qwen)n/an/a929 ±13$13.80
not ranked Alibaba Qwen3 TTS Flash Alibaba (Qwen)n/an/a939 ±14$10 to $11
not ranked Amazon Polly Generative Amazonn/an/a1,063 ±11$30
not ranked Amazon Polly Long-Form Amazonn/an/a1,029 ±13$100
not ranked Amazon Polly Neural Amazonn/an/a894 ±14$16
not ranked Amazon Polly Standard Amazonn/an/a829 ±16$4
not ranked async Flash v1.0 Asyncn/an/a1,049 ±11$10.10
not ranked async Flash v1.5 Asyncn/an/a1,137 ±12$10.10
not ranked async Pro v1.0 Asyncn/an/a1,127 ±12$20.20
not ranked Bland Speech v3 Bland AIn/an/a1,033 ±12$40
not ranked Boson AI Higgs Audio V3 TTS Boson AIn/an/a1,045 ±13$15
not ranked BreezeBlue Breeze TTS 2 BreezeBluen/an/a1,227 ±13$34
not ranked Cartesia Sonic 3 Cartesian/an/a1,054 ±11$49 to $50
not ranked Deepgram Flux TTS DeepgramFast enough267.01,052 ±13$45
not ranked ElevenLabs Eleven v3 ElevenLabsn/an/a1,184 ±10$100
not ranked ElevenLabs Eleven v3 Conversational ElevenLabsn/an/a1,213 ±12$50
not ranked ElevenLabs Eleven v4 ElevenLabsn/an/a1,333 ±16$80
not ranked ElevenLabs Multilingual v2 ElevenLabsn/an/a1,093 ±10$100
not ranked ElevenLabs Turbo v2.5 ElevenLabsn/an/a1,093 ±10$50
not ranked Fish Audio Drama 3 Preview Fish AudioFast enough209.31,245 ±14$15
not ranked Fish Audio OpenAudio S1 Fish Audion/an/a1,084 ±11$15
not ranked Fish Audio S2 Pro Fish Audion/an/a1,108 ±12$15
not ranked Google Gemini 2.5 Flash Lite TTS Googlen/an/a1,087 ±11$9.20
not ranked Google Gemini 2.5 Flash TTS (Dec 2025) Googlen/an/a1,067 ±12$9.20
not ranked Google Gemini 2.5 Pro (Dec 2025) Googlen/an/a1,040 ±12$18.30
not ranked Google Gemini 3.1 Flash TTS Googlen/an/a1,212 ±11$18.30 to $33.30
not ranked Google Gemini 3.8 Flash TTS Googlen/an/a1,280 ±14$15 to $16.50
not ranked Google Gemini 3.8 Flash-Lite TTS Googlen/an/a1,256 ±13$10 to $11
not ranked Gradium TTS (Aug 2026) Gradiumn/an/a1,151 ±12$47.20
not ranked Hume AI Octave 2 Hume AIn/an/a1,056 ±12$87.50 to $100
not ranked Hume AI Octave TTS Hume AIn/an/a1,036 ±11$87.50 to $100
not ranked KugelAudio Kugel 3 KugelAudion/an/a924 ±13n/a
not ranked Maya 2 Flash Maya Researchn/an/a1,065 ±13n/a
not ranked Maya 2 Global Maya Researchn/an/a1,047 ±13n/a
not ranked Maya Research Maya1 Maya Researchn/an/a1,048 ±12n/a
not ranked Microsoft Azure HD 2.5 Microsoftn/an/a1,142 ±11$22
not ranked MiniMax Speech 2.6 HD MiniMaxn/an/a1,126 ±11$100
not ranked MiniMax Speech 2.6 Turbo MiniMaxn/an/a1,120 ±11$60
not ranked MiniMax Speech 2.8 HD MiniMaxn/an/a1,174 ±10$100
not ranked MiniMax Speech 2.8 Turbo MiniMaxn/an/a1,153 ±10$60
not ranked MiniMax Speech-02-HD MiniMaxn/an/a1,108 ±11$100
not ranked MiniMax Speech-02-Turbo MiniMaxn/an/a1,089 ±11$60
not ranked Mistral Voxtral 3 TTS Mistraln/an/a1,221 ±14$13
not ranked Mistral Voxtral TTS Mistraln/an/a1,088 ±12$16
not ranked Neuphonic TTS Neuphonicn/an/a940 ±14$20.80
not ranked OpenAI GPT-Realtime-2 OpenAIn/an/a1,073 ±12$191.60
not ranked OpenAI TTS-1 OpenAIn/an/a1,088 ±10$15
not ranked OpenAI TTS-1 HD OpenAIn/an/a1,106 ±11$30
not ranked Smallest.ai Lightning v3.1 Smallest.ain/an/a1,020 ±12$17.50 to $25
not ranked SpeechifyAI Simba 3.2 SpeechifyFast enough161.11,249 ±12$6.60 to $10
not ranked StepFun Step TTS 2 (Mar 2026) StepFunn/an/a1,135 ±11$40
not ranked StepFun StepAudio 2.5 TTS (Aug 2026) StepFunn/an/a1,212 ±13$85

Frequently asked questions

Which TTS APIs have models rated for assistants?
Starting with the best-ranked, Gradium TTS, Inworld Realtime TTS-2 Flash, SpeechifyAI Simba 3.0, and Inworld Realtime TTS-2; 69 in total.
How many are ranked?
15 of the 69 are in the multilingual speed ranking; the others are not tagged multilingual by Coval or are not measured by it.