← Text-to-Speech 
Cartesia
sonic-3
Measured 2026-09-08
Run sonic-3 on Speko →One API, every model on this board.
Naturalness
1551
Win % · 95% CI
—
Drift
—
not measured
Synth p50
—
not measured
Robustness
—
Not yet measured: the en-US NSW robustness battery has not been run on this model (row added 2026-09-08 with an auto-MOS naturalness estimate). Pending, not exempt.
Cost / 1M chars
$50.0
Derived, not published: Cartesia documents "approximately 1 credit per character" and Pro at $5/100K credits — the same basis as the sonic-3.5 and sonic-3.6 rows.
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