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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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