Speechify
simba-3.5
Measured 2026-11-02
Run simba-3.5 on Speko →One API, every model on this board.
Naturalness
1560
Win % · 95% CI
—
Drift
1
Synth p50
—
Robustness
0.70
Fined:
• fatal · large numbers — never said “eight point one billion” (6 of 7 transcripts)
→ we sent “Population reached 8,100,000,000 in 2023.”
→ it said “Population reached eight billion hundred million in twenty twenty three.”
• minor · formatting · promptable — said “break time”, “equals” out loud (7 of 7 transcripts)
→ we sent “Sure. <break time="1s"/> Your order is ready for pickup.”
→ it said “Sure. Break time equal to one second. Your order is ready for pickup.”
• minor · math operators · promptable — said “equal to” out loud (7 of 7 transcripts)
→ we sent “Remember that 2+2=4 always.”
→ it said “Remember that two plus two equal to four always.”
Cost / 1M chars
$20.0
Vendor list (Starter tier); $16/$12 per 1M at Pro/Scale. Launch price $10 per 1M until 21 Nov 2026 (speechify.ai/pricing).
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