Which is faster, Gradium TTS or Fish Audio S2.1 Pro?

Speed: Gradium TTS comes out ahead (104.3 ms against 533 ms at P95).

Which is rated higher by listeners, Gradium TTS or Fish Audio S2.1 Pro?

Listener rating: Gradium TTS and Fish Audio S2.1 Pro are a tie (Elo 1,174 against 1,184; scores within each other's 95% intervals are a tie).

Which is cheaper, Gradium TTS or Fish Audio S2.1 Pro?

Price: Fish Audio S2.1 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 S2.1 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 S2.1 Pro
Provider	Gradium	Fish Audio
Speed tier	Headroom	Visible delay
P95 time to first audio	104.3 ms	533 ms
Median time to first audio	53.7 ms	328.1 ms
Listener Elo	1,174	1,184
Price per 1M characters	$36 to $57.8	$15
Access	Proprietary	Proprietary
Rank in the full ranking	2	25
Rank by use case	Customer service 1, Voice agents 2, Assistants 1, Entertainment 1, Knowledge sharing 1	Customer service 16, Assistants 16, Entertainment 16, Knowledge sharing 16

Which should you choose?

Speed: Gradium TTS comes out ahead (104.3 ms against 533 ms at P95).
Listener rating: Gradium TTS and Fish Audio S2.1 Pro are a tie (Elo 1,174 against 1,184; scores within each other's 95% intervals are a tie).
Price: Fish Audio S2.1 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 S2.1 Pro.

Frequently asked questions

Which is faster, Gradium TTS or Fish Audio S2.1 Pro?: Speed: Gradium TTS comes out ahead (104.3 ms against 533 ms at P95).
Which is rated higher by listeners, Gradium TTS or Fish Audio S2.1 Pro?: Listener rating: Gradium TTS and Fish Audio S2.1 Pro are a tie (Elo 1,174 against 1,184; scores within each other's 95% intervals are a tie).
Which is cheaper, Gradium TTS or Fish Audio S2.1 Pro?: Price: Fish Audio S2.1 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.