← Text-to-Speech 
#13 / 15
OpenAI
gpt-4o-mini-tts
Naturalness
2.56
Win % · 95% CI
37%
31–43%
Drift
22
Synth p50
674ms
Cost / 1M chars
—
Billed per audio token, not per character.
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URL
https://benchmarks.speko.ai/tts/openai-gpt-4o-mini-tts