Which is faster, Gradium TTS or SpeechifyAI Simba 3.0?

Speed: Gradium TTS comes out ahead (104.3 ms against 149.4 ms at P95).

Which is rated higher by listeners, Gradium TTS or SpeechifyAI Simba 3.0?

Listener rating: Gradium TTS comes out ahead (Elo 1,174 against 1,116; scores within each other's 95% intervals are a tie).

Which is cheaper, Gradium TTS or SpeechifyAI Simba 3.0?

Price: SpeechifyAI Simba 3.0 comes out ahead ($36 to $57.8 against $6.6 to $10 per million characters, lowest list price).

Why is this model always on the left?

Gradium TTS is the reference model of this site's comparison pages: it is set against every other listed model. The editor chose it; it is not chosen by rank.

Comparison · read on October 27, 2026

Gradium TTS vs SpeechifyAI Simba 3.0

Two text-to-speech (TTS) models side by side, from four public benchmarks. Speed comes first, then listener rating and price; the three are never added into a score.

Measure	Gradium TTS	SpeechifyAI Simba 3.0
Provider	Gradium	Speechify
Speed tier	Headroom	Fast enough
P95 time to first audio	104.3 ms	149.4 ms
Median time to first audio	53.7 ms	100.5 ms
Listener Elo	1,174	1,116
Price per 1M characters	$36 to $57.8	$6.6 to $10
Access	Proprietary	Proprietary
Rank in the full ranking	2	6
Rank by use case	Customer service 1, Voice agents 2, Assistants 1, Entertainment 1, Knowledge sharing 1	Customer service 3, Voice agents 6, Assistants 3, Entertainment 3, Knowledge sharing 3

Which should you choose?

Speed: Gradium TTS comes out ahead (104.3 ms against 149.4 ms at P95).
Listener rating: Gradium TTS comes out ahead (Elo 1,174 against 1,116; scores within each other's 95% intervals are a tie).
Price: SpeechifyAI Simba 3.0 comes out ahead ($36 to $57.8 against $6.6 to $10 per million characters, lowest list price).

Where a model is not timed or not rated, nothing is estimated. See each model page for its sources: Gradium TTS and SpeechifyAI Simba 3.0.

Frequently asked questions

Which is faster, Gradium TTS or SpeechifyAI Simba 3.0?: Speed: Gradium TTS comes out ahead (104.3 ms against 149.4 ms at P95).
Which is rated higher by listeners, Gradium TTS or SpeechifyAI Simba 3.0?: Listener rating: Gradium TTS comes out ahead (Elo 1,174 against 1,116; scores within each other's 95% intervals are a tie).
Which is cheaper, Gradium TTS or SpeechifyAI Simba 3.0?: Price: SpeechifyAI Simba 3.0 comes out ahead ($36 to $57.8 against $6.6 to $10 per million characters, lowest list price).
Why is this model always on the left?: Gradium TTS is the reference model of this site's comparison pages: it is set against every other listed model. The editor chose it; it is not chosen by rank.