Inworld
inworld-tts-2
Measured 2026-07-03
Run inworld-tts-2 on Speko →One API, every model on this board.
Naturalness
1561
Win % · 95% CI
63%
57–69%
Drift
10
Synth p50
116ms
116–125 p50–p90
Robustness
0.61
Fined:
• fatal · units — never said “one and a half” (48 of 49 transcripts)
→ we sent “Add 1 1/2 cups of flour.”
→ it said “Add one one-half cups of flour.”
• fatal · ordinals (×0.5) — never said “one thousandth” (49 of 49 transcripts)
→ we sent “This is our 1,000th order.”
→ it said “This is our one zeroth order”
• minor · dates · promptable — said “slash” out loud (4 of 7 transcripts)
→ we sent “The deadline moved to 10/02.”
→ it said “The deadline moved to 10. Slash zero two.”
+ 5 more fined
Cost / 1M chars
$25.0
On-demand. Drops to $20 on Creator and $12.50 on Growth.
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