Which is faster, Gradium TTS or Fish Audio S2 Pro?

Speed: not compared, because a benchmark in this index does not publish it for both models.

Which is rated higher by listeners, Gradium TTS or Fish Audio S2 Pro?

Listener rating: Gradium TTS comes out ahead (Elo 1,174 against 1,108; scores within each other's 95% intervals are a tie).

Which is cheaper, Gradium TTS or Fish Audio S2 Pro?

Price: Fish Audio S2 Pro comes out ahead ($36 to $57.8 against $15 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 Fish Audio S2 Pro

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	Fish Audio S2 Pro
Provider	Gradium	Fish Audio
Speed tier	Headroom	Not timed
P95 time to first audio	104.3 ms	Not timed
Median time to first audio	53.7 ms	Not timed
Listener Elo	1,174	1,108
Price per 1M characters	$36 to $57.8	$15
Access	Proprietary	Open weights
Rank in the full ranking	2	49
Rank by use case	Customer service 1, Voice agents 2, Assistants 1, Entertainment 1, Knowledge sharing 1	Customer service 31, Assistants 36, Entertainment 36, Knowledge sharing 36

Which should you choose?

Speed: not compared, because a benchmark in this index does not publish it for both models.
Listener rating: Gradium TTS comes out ahead (Elo 1,174 against 1,108; scores within each other's 95% intervals are a tie).
Price: Fish Audio S2 Pro comes out ahead ($36 to $57.8 against $15 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 Fish Audio S2 Pro.

Frequently asked questions

Which is faster, Gradium TTS or Fish Audio S2 Pro?: Speed: not compared, because a benchmark in this index does not publish it for both models.
Which is rated higher by listeners, Gradium TTS or Fish Audio S2 Pro?: Listener rating: Gradium TTS comes out ahead (Elo 1,174 against 1,108; scores within each other's 95% intervals are a tie).
Which is cheaper, Gradium TTS or Fish Audio S2 Pro?: Price: Fish Audio S2 Pro comes out ahead ($36 to $57.8 against $15 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.