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Text-to-Speech · Multilingual

Norwegian

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Benchmarks

X
Y
200ms400ms600ms800ms140016001800Time to first audio lower is betterNaturalness higher is betterCartesia sonic-3.5Gemini 3.1-flash-tts-previewElevenLabs eleven_v3_conversationalSoniox tts-rt-v2OpenAI gpt-4o-mini-ttsMiniMax speech-2.8-hdspeko.ai/benchmarks

Naturalness

higher is better

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

field averagetied with bestMiniMaxMiniMaxspeech-2.8-hd1386OpenAIgpt-4o-mini-tts1420AzureAzureAI Speech (native)1467SpeechifySpeechifysimba-3.51575Sonioxtts-rt-v21621ElevenLabseleven_v3_conversational1628GeminiGemini3.1-flash-tts-preview1705Cartesiasonic-3.51836
12001400160018002000

Time to first audio

lower is better

The pause the caller hears before the agent starts speaking. Figures are the English measurement — Norwegian has no sweep of its own yet.

Cartesiasonic-3.5108ms · 234ms
xAI Groktts251ms · 291ms
ElevenLabseleven_v3_conversational255ms · 298ms
MiniMaxMiniMaxspeech-2.8-hd329ms · 429ms
Sonioxtts-rt-v2406ms · 462ms
ElevenLabseleven_v3474ms · 622ms
OpenAIgpt-4o-mini-tts724ms · 1.03s
GeminiGemini3.1-flash-tts-preview810ms · 987ms
0ms300ms600ms900ms

p50 p90

Robustness

higher is better

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

0.78
0.75
0.50
Gemini0.45
0.43
Google Chirp0.25
0.25
0.07
Speechify0.00
Speechify0.00
MiniMax0.00
0.000.250.500.751.00

Cost

lower is better

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

$13
$15
$20
$20
$33
$50
$50
$100
Sonioxtts-rt-v2xAI GrokttsOpenAIgpt-4o-mini-ttsSpeechifySpeechifysimba-3.5GeminiGemini3.1-flash-tts-previewElevenLabseleven_v3_conversationalCartesiasonic-3.5MiniMaxMiniMaxspeech-2.8-hd