Inworld
inworld-tts-2-flash
Measured 2026-09-03
Run inworld-tts-2-flash on Speko →One API, every model on this board.
Naturalness
1501
Win % · 95% CI
—
not measured
Drift
14
Measured 2026-10-30
Synth p50
82ms
82–89 p50–p90
Robustness
0.64
Fined:
• fatal · decimals — never said “zero point zero zero zero zero zero one” (7 of 7 transcripts)
→ we sent “The drift is 0.000001 per cycle.”
→ it said “The drift is zero point zero zero zero zero one per cycle.”
• 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 (4 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.”
+ 1 more fined
Cost / 1M chars
$15.0
On-demand.
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