Data read October 27, 2026
Gradium TTS vs Out of Set Airy TTS: TTS API comparison
On P95 latency, Gradium TTS is faster: 104.3 ms for Gradium TTS against 453.9 ms for Out of Set Airy TTS.
Listener Elo is not available for both models, so voice preference is not compared. List price per million characters: $36 to $57.80 for Gradium TTS, $3.67 for Out of Set Airy TTS.
Gradium TTS is ranked 1 of 23; Out of Set Airy TTS is not in the multilingual speed ranking. Every comparison on this site uses Gradium TTS as its fixed reference, and no page says either model is better overall.
| Measure | Gradium TTS | Out of Set Airy TTS | Ahead |
|---|---|---|---|
| Rank in the multilingual speed ranking | 1 | not ranked | n/a |
| Speed tier | Headroom | Visible delay | n/a |
| Median time to first audio (ms), lower is faster | 53.7 | 212.3 | Gradium TTS |
| P95 time to first audio (ms), lower is faster | 104.3 | 453.9 | Gradium TTS |
| Listener Elo (Artificial Analysis) | 1,174 | n/a | n/a |
| Customer-service Elo (Artificial Analysis) | 1,241 | n/a | n/a |
| Naturalness (Speko) | 1,592 | 1,416 | Gradium TTS |
| Naturalness estimate (Cekura, 1 to 5) | 4.51 | n/a | n/a |
| Reading accuracy (Cekura) | 79.5% | n/a | n/a |
| Hard passages judged correct (Artificial Analysis) | n/a | n/a | n/a |
| Lowest list price per 1M characters (lower is cheaper) | $36 to $57.80 | $3.67 | Out of Set Airy TTS |
| Languages tested (Artificial Analysis, Speko) | 4 | 0 | Gradium TTS |
| Access | Proprietary | Proprietary | n/a |
| Streaming status | Measured | Measured | n/a |
Ahead is computed from the figures only. A latency gap under 10 ms is a tie; listener Elo values whose 95% intervals overlap are a tie. A measure one benchmark does not hold is n/a for that model and is never estimated. See the methodology and each model page for sources.
Frequently asked questions
- Is Gradium TTS faster than Out of Set Airy TTS?
- On P95 latency, Gradium TTS is faster: 104.3 ms for Gradium TTS against 453.9 ms for Out of Set Airy TTS.
- How do Gradium TTS and Out of Set Airy TTS compare on voice quality?
- Listener Elo is not available for both models, so voice preference is not compared.
- Which is cheaper, Gradium TTS or Out of Set Airy TTS?
- List price per million characters: $36 to $57.80 for Gradium TTS, $3.67 for Out of Set Airy TTS.