Sonic
FAIR · middle third for this operationCartesia Sonic costs $0.0376 for one minute of speech. That is the middle third of the 8 entries we price on the same operation.
Sonic · the arithmetic
the unit$0.00005 per credit · Pro plan, $5/month — the cheapest paid tier, and the one a single professional would buy. 100,000 credits/month.
the meterThe pricing page annotates each plan's credit quota with its minute equivalent: Pro = '100K credits (~133 min)'. That is Cartesia's own credits-to-minutes equivalence, ~752 credits per minute of speech.
the sum$5 / 133 minutes = $0.0376 per minute. Both numbers come from the same line of the pricing page; no characters-per-minute assumption of ours is used.
the verdictFAIR · middle third for this operation
the catchThe same plan includes ~9h 16m of speech-to-text. Voice agents are billed separately at $0.06/minute of call.
read on 14 sep 2026 · pricing page ↗ · documentation ↗
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How much does Sonic cost on Cartesia?
$0.0376 for 1 min of speech, read from Cartesia's own pages on 14 sep 2026. The meter: The pricing page annotates each plan's credit quota with its minute equivalent: Pro = '100K credits (~133 min)'. That is Cartesia's own credits-to-minutes equivalence, ~752 credits per minute of speech..
Where does this number come from?
$5 / 133 minutes = $0.0376 per minute. Both numbers come from the same line of the pricing page; no characters-per-minute assumption of ours is used.
What counts as one operation here?
1 min of speech. Every entry in the same operation is priced on that same unit, which is what makes the comparison mean anything.