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Text-to-Speech · Multilingual

Korean

Language

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Benchmarks

X
Y
200ms400ms600ms800ms10001500Time to first audio lower is betterNaturalness higher is betterGemini 3.1-flash-tts-previewCartesia sonic-3.5Inworld tts-2ElevenLabs eleven_v3_conversationalOpenAI gpt-4o-mini-ttsMiniMax speech-2.6-hdRime codaAWS Polly generativespeko.ai/benchmarks

Naturalness

higher is better

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

field averagetied with bestAPAWS Pollygenerative953RimeRimecoda1187MiniMaxMiniMaxspeech-2.6-hd1407AzureAzureAI Speech (native)1438OpenAIgpt-4o-mini-tts1498ElevenLabseleven_v3_conversational1628InworldInworldtts-21722Cartesiasonic-3.51859GeminiGemini3.1-flash-tts-preview1917
400800120016002000

Time to first audio

lower is better

The pause the caller hears before the agent starts speaking.

InworldInworldtts-2122ms · 134ms
Cartesiasonic-3.5132ms · 246ms
RimeRimecoda223ms · 253ms
APAWS Pollygenerative241ms · 278ms
MiniMaxMiniMaxspeech-2.6-hd336ms · 373ms
OpenAIgpt-4o-mini-tts449ms · 855ms
GeminiGemini3.1-flash-tts-preview678ms · 1.02s
ElevenLabseleven_v3_conversational774ms · 939ms
0ms300ms600ms900ms

p50 p90

Robustness

higher is better

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

Gemini0.75
Inworld0.60
0.50
Rime0.00
0.00
AP0.00
0.00
MiniMax0.00
0.000.250.500.751.00

Cost

lower is better

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

$20
$25
$33
$50
$50
$50
$100
OpenAIgpt-4o-mini-ttsInworldInworldtts-2GeminiGemini3.1-flash-tts-previewRimeRimecodaElevenLabseleven_v3_conversationalCartesiasonic-3.5MiniMaxMiniMaxspeech-2.6-hd