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Inworld

inworld-tts-2 (reasoning)

Measured 2026-10-30

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inworld-tts-2 (reasoning) is measured here for comparison — it is not one of the models Speko routes.

Naturalness

—

Win % · 95% CI

—

Drift

11

Synth p50

—

Robustness

0.82

Fined:

• fatal · ordinals (×0.5) — never said “one thousandth” (7 of 7 transcripts)

→ we sent “This is our 1,000th order.”

→ it said “This is our one, zeroth order.”

• minor · times · promptable — said “slash” out loud (6 of 7 transcripts)

→ we sent “Meet at 8:45 a.m. PT / 11:45 a.m. ET.”

→ it said “Meet at eight forty-five a.m. Pacific Time slash eleven forty-five a.m. Eastern Time”

• minor · dates · promptable (international, ×0.4) — said “slash” out loud (7 of 7 transcripts)

→ we sent “The lease ends 2025/06/30.”

→ it said “The lease ends two thousand twenty-five slash zero six slash thirty.”

Cost / 1M chars

$25.0

Same characters billed as reasoning off.

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