← Text-to-Speech

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.

Share this result

Embed the live badge

Speko tts rank
Markdown
[![Speko tts rank](https://speko.ai/benchmarks/badge/tts/inworld-inworld-tts-2-flash.svg)](https://speko.ai/benchmarks/tts/inworld-inworld-tts-2-flash)
HTML
<a href="https://speko.ai/benchmarks/tts/inworld-inworld-tts-2-flash"><img src="https://speko.ai/benchmarks/badge/tts/inworld-inworld-tts-2-flash.svg" alt="Speko tts rank"></a>
URL
https://speko.ai/benchmarks/tts/inworld-inworld-tts-2-flash