Bracketed cue
Why we chose this prompt: Bracketed stage directions like [whispering] and [excited] are a common way to direct delivery. The model has to act on them and not read them aloud, and the two cues in one prompt test whether it can switch.
Prompt
[whispering] Route 6 Espresso is open till nine, and the last train leaves at eleven fifty-six. [excited] The last train leaves at eleven fifty-six!
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provider default
Cost$0.002Generation time2.3sCorrectness100%provider default
Cost$0.002Generation time1.5sCorrectness100%
Zephyr
Cost--Generation time10.0sCorrectness100%
en-US-Harper:MAI-Voice-2
Cost$0.003Generation time2.3sCorrectness100%
loongjohn
Cost$0.002Generation time3.1sCorrectness100%longanlingxin
Cost$0.003Generation time2.9sCorrectness100%eve
Cost$0.002Generation time1.6sCorrectness100%tara
Cost$0.001Generation time10.5sCorrectness92%provider default
Cost--Generation time1.3sCorrectness92%
af_alloy
Cost$0.000092Generation time3.6sCorrectness92%English_expressive_narrator
Cost$0.015Generation time2.3sCorrectness92%English_expressive_narrator
Cost$0.009Generation time1.4sCorrectness92%
en_paul_sad
Cost$0.000Generation time2.1sCorrectness92%en-US-Harper:MAI-Voice-2
Cost$0.002Generation time1.9sCorrectness88%
aura-2-thalia-en
Cost$0.004Generation time4.1sCorrectness85%conversational_a
Cost$0.001Generation time9.9sCorrectness44%