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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