What is the best text-to-speech API for each use case?

customer service: Gradium TTS, voice agents: Fluxions vui, assistants: Gradium TTS, entertainment: Gradium TTS and knowledge sharing: Gradium TTS. These are the models with the shortest wait for the first sound in each use case, in the order of the ranking; read the use case page before you choose.

How are the TTS models ranked?

Speed first: models are grouped into three tiers from Coval's P95 time to first audio (Headroom under 120 ms, Fast enough up to 293 ms, Visible delay above), then ordered by P95. Voice quality, accuracy and price are shown side by side and never added into one score.

Where does the data come from?

Four public benchmarks: Coval, Speko, Artificial Analysis and Cekura, read on October 27, 2026. This site runs no test of its own and estimates nothing; a missing measure is listed as not collected, with the reason.

Which models are listed?

96 streaming TTS models from 35 providers: every model a benchmark times, plus models whose vendor documents a streaming API. Models that cannot stream are left out, because a voice agent cannot wait for a whole sentence.

What does P95 time to first audio mean?

It is the wait before the first sound for the slowest 5% of requests, measured over 30 days. The median is the typical wait; P95 is the slow turn a caller actually notices.

Text-to-speech, US · read on October 27, 2026

Which text-to-speech API fits your use case?

96 streaming TTS models from 35 providers, grouped by what you build: customer service, voice agents, assistants, entertainment, knowledge sharing. Ranked by speed, with voice quality, accuracy and price beside it. Nothing is added into a score.

See the full ranking Fastest models

Shortest wait for the first sound

P95 time to first audio, Coval, 30 days. Shorter bar, faster voice.

Bars drawn on a 0 to 300 ms scale.

Pick your use case

Customer service
70 models ranked

Contact centers and support lines.

Fastest: Gradium TTS
Voice agents
13 models ranked

Real-time phone and web voice agents.

Fastest: Fluxions vui
Assistants
69 models ranked

Voice assistants and conversational apps.

Fastest: Gradium TTS
Entertainment
69 models ranked

Games, characters and interactive media.

Fastest: Gradium TTS
Knowledge sharing
73 models ranked

Audiobooks, narration, e-learning and accessibility.

Fastest: Gradium TTS

Quick comparison: the 10 fastest TTS models

From the full ranking of 86 models, in rank order: speed tier, then P95, ties within 10 ms ordered by median. See all 96.

The 10 fastest TTS models
Rank	Model	Speed tier	P95	Median	Listener Elo	Price per 1M chars	Best for
1	Fluxions vuiFluxions	Headroom	75 ms	39.7 ms	Not rated	$9	Voice agents
2	Gradium TTSGradium	Headroom	104.3 ms	53.7 ms	1,174	$36 to $57.8	Customer service, Voice agents, Assistants, Entertainment, Knowledge sharing
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
4	Alibaba Qwen3 TTS FastAlibaba (Qwen)	Headroom	98.8 ms	62.9 ms	Not rated	$10	Voice agents
5	Alibaba Qwen3 TTS 1.7bAlibaba (Qwen)	Fast enough	136.6 ms	103.6 ms	Not rated	Not collected	Voice agents
6	SpeechifyAI Simba 3.0Speechify	Fast enough	149.4 ms	100.5 ms	1,116	$6.6 to $10	Customer service, Voice agents, Assistants, Entertainment, Knowledge sharing
7	SpeechifyAI Simba 3.2Speechify	Fast enough	161.1 ms	104.3 ms	1,249	$6.6 to $10	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
9	Palabra TTS v1Palabra	Fast enough	214.3 ms	105.1 ms	Not rated	$12	Voice agents
10	Fish Audio Drama 3 PreviewFish Audio	Fast enough	209.3 ms	146 ms	1,245	$15	Customer service, Voice agents, Assistants, Entertainment, Knowledge sharing

Headroom

models, P95 under 120 ms

Fast enough

models, P95 up to 293 ms

Visible delay

models, P95 above 293 ms

Looking for an alternative?

Frequently asked questions

What is the best text-to-speech API for each use case?: customer service: Gradium TTS, voice agents: Fluxions vui, assistants: Gradium TTS, entertainment: Gradium TTS and knowledge sharing: Gradium TTS. These are the models with the shortest wait for the first sound in each use case, in the order of the ranking; read the use case page before you choose.
How are the TTS models ranked?: Speed first: models are grouped into three tiers from Coval's P95 time to first audio (Headroom under 120 ms, Fast enough up to 293 ms, Visible delay above), then ordered by P95. Voice quality, accuracy and price are shown side by side and never added into one score.
Where does the data come from?: Four public benchmarks: Coval, Speko, Artificial Analysis and Cekura, read on October 27, 2026. This site runs no test of its own and estimates nothing; a missing measure is listed as not collected, with the reason.
Which models are listed?: 96 streaming TTS models from 35 providers: every model a benchmark times, plus models whose vendor documents a streaming API. Models that cannot stream are left out, because a voice agent cannot wait for a whole sentence.
What does P95 time to first audio mean?: It is the wait before the first sound for the slowest 5% of requests, measured over 30 days. The median is the typical wait; P95 is the slow turn a caller actually notices.