Invoice line
Why we chose this prompt: A dollar amount, an ISO date and an alphanumeric reference code in one line. Each has a conventional spoken form, and reading them as written or guessing wrong is a common failure in production use.
Prompt
The invoice totals $1,156.40, due 2026-08-24, reference KWAI-9F.
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Zephyr
Cost--Generation time7.5sCorrectness79%
loongjohn
Cost--Generation time2.1sCorrectness71%
aura-2-thalia-en
Cost$0.002Generation time3.1sCorrectness53%provider default
Cost$0.00096Generation time1.7sCorrectness53%
en-US-Harper:MAI-Voice-2
Cost$0.001Generation time1.1sCorrectness50%conversational_a
Cost$0.00045Generation time21.7sCorrectness44%en-US-Harper:MAI-Voice-2
Cost$0.00096Generation time1.3sCorrectness37%
af_alloy
Cost$0.00004Generation time0.5sCorrectness33%eve
Cost$0.00096Generation time1.7sCorrectness31%
en_paul_sad
Cost--Generation time2.0sCorrectness30%provider default
Cost--Generation time2.2sCorrectness27%tara
Cost$0.00045Generation time9.4sCorrectness24%English_expressive_narrator
Cost$0.006Generation time1.7sCorrectness24%English_expressive_narrator
Cost--Generation time1.3sCorrectness24%longanlingxin
Cost$0.001Generation time3.3sCorrectness23%provider default
Cost$0.00096Generation time1.1sCorrectness21%