Data read October 27, 2026
Gradium TTS vs Fluxions vui: TTS API comparison
On P95 latency, Fluxions vui is faster: 104.3 ms for Gradium TTS against 75.0 ms for Fluxions vui.
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, $9 for Fluxions vui.
Gradium TTS is ranked 1 of 23; Fluxions vui 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 | Fluxions vui | Ahead |
|---|---|---|---|
| Rank in the multilingual speed ranking | 1 | not ranked | n/a |
| Speed tier | Headroom | Headroom | n/a |
| Median time to first audio (ms), lower is faster | 53.7 | 39.7 | Fluxions vui |
| P95 time to first audio (ms), lower is faster | 104.3 | 75.0 | Fluxions vui |
| 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 | n/a | n/a |
| 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 | $9 | Fluxions vui |
| 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 Fluxions vui?
- On P95 latency, Fluxions vui is faster: 104.3 ms for Gradium TTS against 75.0 ms for Fluxions vui.
- How do Gradium TTS and Fluxions vui compare on voice quality?
- Listener Elo is not available for both models, so voice preference is not compared.
- Which is cheaper, Gradium TTS or Fluxions vui?
- List price per million characters: $36 to $57.80 for Gradium TTS, $9 for Fluxions vui.