← Text-to-Speech

ElevenLabs

eleven_v3_conversational

Measured 2026-07-03

Naturalness

1590

Win % · 95% CI

66%

60–72%

Drift

20

Synth p50

266ms

265–268 two-sweep p50

Robustness

0.24

Fined:

• fatal · currency — dropped the minus sign (7 of 7 transcripts)

→ we sent “A refund of -$0.99 was applied.”

→ it said “A refund of 99 cents was applied.”

• fatal · currency (international, ×0.4) — dropped the minus sign (7 of 7 transcripts)

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

→ it said “Balance: 45,090 outstanding.”

• minor · dates — kept the value but never said “july”; a prompt fixes this (7 of 23 transcripts)

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

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

• minor · dates — kept the value but never said “october”; a prompt fixes this (6 of 23 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 (4 of 7 transcripts)

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

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

• minor · dates — kept the value but never said “february”; a prompt fixes this (9 of 23 transcripts)

→ we sent “Renewal is 02/29/2024.”

→ it said “Renewal is two twenty nine twenty twenty four.”

• serious · dates (international, ×0.4) — never said “march” (4 of 7 transcripts)

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

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

• minor · dates (international, ×0.4) — kept the value but never said “june”; a prompt fixes this (4 of 7 transcripts)

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

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

• minor · math operators — kept the value but never said “minus”; a prompt fixes this (6 of 7 transcripts)

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

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

• fatal · times — never said “a m” (3 of 7 transcripts)

→ we sent “We open at 9:00am.”

→ it said “We open at nine.”

Cost / 1M chars

$100

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