Data read October 27, 2026
Gradium TTS vs Deepgram Flux TTS: TTS API comparison
On P95 latency, Gradium TTS is faster: 104.3 ms for Gradium TTS against 267.0 ms for Deepgram Flux TTS.
On Artificial Analysis listener Elo, Gradium TTS is ahead (1,174 for Gradium TTS, 1,052 for Deepgram Flux TTS). List price per million characters: $36 to $57.80 for Gradium TTS, $45 for Deepgram Flux TTS.
Gradium TTS is ranked 1 of 23; Deepgram Flux 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 | Deepgram Flux TTS | Ahead |
|---|---|---|---|
| Rank in the multilingual speed ranking | 1 | not ranked | n/a |
| Speed tier | Headroom | Fast enough | n/a |
| Median time to first audio (ms), lower is faster | 53.7 | 197.7 | Gradium TTS |
| P95 time to first audio (ms), lower is faster | 104.3 | 267.0 | Gradium TTS |
| Listener Elo (Artificial Analysis) | 1,174 | 1,052 | Gradium TTS |
| Customer-service Elo (Artificial Analysis) | 1,241 | 1,140 | Gradium TTS |
| Naturalness (Speko) | 1,592 | 1,550 | Gradium TTS |
| Naturalness estimate (Cekura, 1 to 5) | 4.51 | 4.16 | Gradium TTS |
| Reading accuracy (Cekura) | 79.5% | 77.4% | Gradium TTS |
| Hard passages judged correct (Artificial Analysis) | n/a | 72.4% | n/a |
| Lowest list price per 1M characters (lower is cheaper) | $36 to $57.80 | $45 | Gradium 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 Deepgram Flux TTS?
- On P95 latency, Gradium TTS is faster: 104.3 ms for Gradium TTS against 267.0 ms for Deepgram Flux TTS.
- How do Gradium TTS and Deepgram Flux TTS compare on voice quality?
- On Artificial Analysis listener Elo, Gradium TTS is ahead (1,174 for Gradium TTS, 1,052 for Deepgram Flux TTS).
- Which is cheaper, Gradium TTS or Deepgram Flux TTS?
- List price per million characters: $36 to $57.80 for Gradium TTS, $45 for Deepgram Flux TTS.