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Text-to-Speech · Multilingual

Lithuanian

Language

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Benchmarks

X
Y
20ms50ms100ms200ms500ms1.00s1200140016001800Time to first audio lower is better · log scaleNaturalness higher is betterGemini 3.8-flash-lite-ttsElevenLabs eleven_v4_turboGemini 3.8-flash-ttsSoniox tts-rt-v2Azure AI Speech (native)xAI Grok ttsOpenAI gpt-4o-mini-ttsspeko.ai/benchmarks

Naturalness

higher is better

1500 is this language's own field — not comparable across languages.

field averagetied with bestOpenAIgpt-4o-mini-tts1206xAI Groktts1235AzureAzureAI Speech (native)1288Google Chirp 3 HDGoogle Chirp 3 HD1418Sonioxtts-rt-v21623GeminiGemini3.8-flash-tts1727ElevenLabseleven_v4_turbo1735GeminiGemini3.8-flash-lite-tts1767
10001200140016001800

Time to first audio

Region

The pause the caller hears before the agent starts speaking. Measured from US East straight to each vendor, on the study's Lithuanian voices.

AzureAzureAI Speech (native)22ms · 59ms
ElevenLabseleven_v4_turbo284ms · 414ms
Sonioxtts-rt-v2290ms · 322ms
xAI Groktts292ms · 351ms
OpenAIgpt-4o-mini-tts461ms · 626ms
GeminiGemini3.8-flash-lite-tts464ms · 552ms
GeminiGemini3.8-flash-tts1.01s · 1.29s
0ms300ms600ms900ms

p50 p90

Robustness

higher is better

Whether the voice says the right words for a number, date, currency amount or operator.

0.83
Gemini0.75
Gemini0.75
0.73
Azure0.55
0.13
0.13
Google Chirp 3 HD0.06
0.000.250.500.751.00

Cost

lower is better

$ per 1M characters · vendor list price, the same in every language

$10
$13
$15
$15
$20
$40
GeminiGemini3.8-flash-lite-ttsSonioxtts-rt-v2GeminiGemini3.8-flash-ttsxAI GrokttsOpenAIgpt-4o-mini-ttsElevenLabseleven_v4_turbo