← Text-to-Speech 
Speechify
simba-3.2
Measured 2026-07-03
Naturalness
1573
Win % · 95% CI
63%
57–69%
Drift
7
Synth p50
345ms
345–375 p50–p90
Robustness
0.70
Fined:
• fatal · decimals — dropped the minus sign (7 of 7 transcripts)
→ we sent “Growth slowed to -0.5% this month.”
→ it said “Growth slowed to 0.5% this month.”
• minor · math operators — said “equal to” out loud; a prompt fixes this (4 of 8 transcripts)
→ we sent “Remember that 2+2=4 always.”
→ it said “Remember that two plus two equal to four always.”
Cost / 1M chars
$10.0
Vendor list (Starter tier); $6–8 per 1M at Pro/Scale volume.
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