Deepgram · Proprietary · Read 2026-10-27
Deepgram Flux TTS: latency, voice quality, price and languages
- Rank
- not ranked
- Speed tier
- Fast enough
- P95
- 267.0 ms
- Price / 1M chars
- $45
Deepgram Flux TTS is a proprietary text-to-speech model from Deepgram. Coval measures a median of 197.7 ms and a P95 of 267.0 ms to first audio, which puts it in the Fast enough speed tier. It is not ranked because Coval does not tag it multilingual. No source tested it in a language other than English.
This summary is generated from the measures below; it is not a vendor description. Measures a source does not hold are shown as n/a and are never estimated.
Speed (Coval, 30 days, US East, English)
| Speed tier | Fast enough |
| Median time to first audio | 197.7 ms |
| P90 | 246.8 ms |
| P95 | 267.0 ms |
| Mean | 203.0 ms |
| Standard deviation | 78.8 ms |
| Calls in the window | 2,688 |
| Cekura median, streamed text | 154 ms |
| Cekura median, full text | 194 ms |
Voice quality (never added together)
| Listener Elo (Artificial Analysis) | 1,052 ±13 |
| Customer-service Elo (Artificial Analysis) | 1,140 ±26 |
| Naturalness (Speko) | 1,550 |
| Naturalness estimate (Cekura, 1 to 5) | 4.16 |
Accuracy
| Reading accuracy (Cekura) | 77.4% |
| Numbers (Cekura) | 72% |
| Codes (Cekura) | 81% |
| Context (Cekura) | 69% |
| Medical terms (Cekura) | 97% |
| Hard passages judged correct (Artificial Analysis) | 72.4% |
| Numbers and dates (Speko score) | 0.20 |
| Word error rate (Coval) | 1.8% |
Price per 1 million characters
| Range across sources | $45 |
| Artificial Analysis | $45 |
| Speko | $45 |
| Coval | n/a |
| Cekura | $45 |
Coverage
| Access | Proprietary |
| Streaming | Measured |
| Coval tags | n/a |
| Rated for | Knowledge sharing, Assistants, Entertainment, Customer service, Voice agents |
| Languages tested | none beyond English |
Not collected
Every measure of the database is filled for this model.
Sources
- https://artificialanalysis.ai/text-to-speech (read 2026-10-27)
- https://artificialanalysis.ai/text-to-speech/leaderboard/provider-voice (read 2026-10-27)
- https://benchmarks.cekura.ai/text-to-speech (read 2026-10-27)
- https://benchmarks-api-6wxgp27p2a-ue.a.run.app/v1/results/aggregates?benchmark=TTS&window=30d&include_series=false (read 2026-10-27)
- https://benchmarks.speko.ai/tts/ (read 2026-10-27)
- Vendor site: https://deepgram.com/
Keep exploring
Frequently asked questions
- How fast is Deepgram Flux TTS?
- Coval measures a median time to first audio of 197.7 ms and a P95 of 267.0 ms for Deepgram Flux TTS, over 30 days from the US East in English (Fast enough tier).
- How much does Deepgram Flux TTS cost?
- The benchmarks print a list price of $45 per million characters for Deepgram Flux TTS.
- Which languages was Deepgram Flux TTS tested in?
- No source tested Deepgram Flux TTS in a language other than English.