Mistral
Voxtral Mini TTS 3
Measured 2026-10-22
Build voice agents on Speko →Voxtral Mini TTS 3 is measured here for comparison — it is not one of the models Speko routes.
Naturalness
1411
Win % · 95% CI
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Drift
17
Measured 2026-10-22. All 20 takes of the same text differ; mean pairwise distance 0.172.
Synth p50
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Robustness
0.41
Fined:
• fatal · currency — dropped the minus sign (7 of 7 transcripts)
→ we sent “The balance is -$12.50.”
→ it said “The balance is twelve dollars and fifty cents.”
• fatal · large numbers — never said “eight point one billion” (6 of 7 transcripts)
→ we sent “Population reached 8,100,000,000 in 2023.”
→ it said “population reached eight million one hundred million in twenty twenty three”
• serious · dates — never said “january” (7 of 7 transcripts)
→ we sent “Renewal falls on 1/1/2027.”
→ it said “Renewal falls on one first twenty twenty seven.”
+ 12 more fined
Cost / 1M chars
$13.0
Mistral lists $13 per 1M input characters (docs.mistral.ai model page, read 2026-10-22).
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