← Text-to-Speech

Deepgram

aura-2

Measured 2026-07-03

Naturalness

1584

Win % · 95% CI

65%

58–70%

Drift

9

Synth p50

125ms

125–138 p50–p90

Robustness

0.41

Fined:

• minor · currency (international, ×0.4) — kept the value but never said “forty five”; a prompt fixes this (7 of 16 transcripts)

→ we sent “Balance: -€45,90 outstanding.”

→ it said “Negative four thousand five hundred ninety euros outstanding.”

• minor · dates — kept the value but never said “july”; a prompt fixes this (7 of 16 transcripts)

→ we sent “Your appointment is on 07/15/2026.”

→ it said “Your appointment is on zero seven fifteen, twenty twenty six.”

• minor · dates — kept the value but never said “january”; a prompt fixes this (7 of 16 transcripts)

→ we sent “Renewal falls on 1/1/2027.”

→ it said “Renewal falls on one one twenty twenty seven.”

• minor · dates — kept the value but never said “november”; a prompt fixes this (7 of 16 transcripts)

→ we sent “The policy started 11/30/2024.”

→ it said “The policy started eleven thirty twenty twenty four.”

• minor · dates — kept the value but never said “october”; a prompt fixes this (7 of 16 transcripts)

→ we sent “The deadline moved to 10/02.”

→ it said “The deadline moved to ten 'o two.”

• minor · dates — kept the value but never said “march”; a prompt fixes this (7 of 16 transcripts)

→ we sent “Your slot is 03/09 this year.”

→ it said “Your slot is zero three zero nine this year.”

• minor · dates (international, ×0.4) — kept the value but never said “march”; a prompt fixes this (7 of 16 transcripts)

→ we sent “The order shipped on 2026-03-09.”

→ it said “The order shipped on twenty twenty six o three zero nine.”

• minor · dates (international, ×0.4) — kept the value but never said “june”; a prompt fixes this (7 of 16 transcripts)

→ we sent “The lease ends 2025/06/30.”

→ it said “The lease ends twenty twenty five o six thirty.”

• fatal · large numbers — never said “zero zero” (5 of 5 transcripts)

→ we sent “Only 007 seats remain.”

→ it said “Only seven seats remain.”

• minor · math operators — kept the value but never said “minus”; a prompt fixes this (3 of 5 transcripts)

→ we sent “That leaves 10-4=6 remaining.”

→ it said “That leaves ten-four equals six remaining.”

• minor · math operators — kept the value but never said “three quarters”; a prompt fixes this (5 of 5 transcripts)

→ we sent “Give me 3/4 of the batch.”

→ it said “Give me three four of the batch.”

• minor · math operators — kept the value but never said “times”; a prompt fixes this (3 of 5 transcripts)

→ we sent “Check it: 7×8=56, not 54.”

→ it said “Check it, seven x eight equals fifty-six, not fifty-four.”

• fatal · math operators — never said “divided” (4 of 5 transcripts)

→ we sent “That is 100÷4=25 per person.”

→ it said “That is 104 equals 25 per person.”

• minor · math operators — kept the value but never said “two thirds”; a prompt fixes this (5 of 5 transcripts)

→ we sent “Use 2/3 cup of sugar.”

→ it said “Use two-three cup of sugar.”

Cost / 1M chars

$30.0

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