Google · Proprietary · Read 2026-10-27
Google Gemini 3.8 Flash TTS: latency, voice quality, price and languages
- Rank
- not ranked
- Speed tier
- n/a
- P95
- n/a
- Price / 1M chars
- $15 to $16.50
Google Gemini 3.8 Flash TTS is a proprietary text-to-speech model from Google. Coval does not measure its latency, so it has no speed tier and no rank. Artificial Analysis or Speko tested it in 9 languages.
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 | n/a |
| Median time to first audio | n/a |
| P90 | n/a |
| P95 | n/a |
| Mean | n/a |
| Standard deviation | n/a |
| Calls in the window | n/a |
| Cekura median, streamed text | n/a |
| Cekura median, full text | 1,287 ms |
Voice quality (never added together)
| Listener Elo (Artificial Analysis) | 1,280 ±14 |
| Customer-service Elo (Artificial Analysis) | 1,341 ±28 |
| Naturalness (Speko) | 1,642 |
| Naturalness estimate (Cekura, 1 to 5) | n/a |
Accuracy
| Reading accuracy (Cekura) | n/a |
| Numbers (Cekura) | 84% |
| Codes (Cekura) | 82% |
| Context (Cekura) | 98% |
| Medical terms (Cekura) | 100% |
| Hard passages judged correct (Artificial Analysis) | 89.5% |
| Numbers and dates (Speko score) | 0.70 |
| Word error rate (Coval) | n/a |
Price per 1 million characters
| Range across sources | $15 to $16.50 |
| Artificial Analysis | $16.50 |
| Speko | $15 |
| Coval | n/a |
| Cekura | n/a |
Coverage
| Access | Proprietary |
| Streaming | Measured |
| Coval tags | n/a |
| Rated for | Knowledge sharing, Assistants, Entertainment, Customer service |
| Languages tested | Arabic, Chinese, French, German, Hindi, Japanese, Portuguese, Spanish, Vietnamese |
Not collected
- Speed (Coval median time to first audio): not measured by Coval (reading of 2026-10-27, 30-day window)
- Speed (Coval P95 time to first audio): not measured by Coval (reading of 2026-10-27, 30-day window)
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.speko.ai/tts/ (read 2026-10-27)
- Vendor site: https://cloud.google.com/text-to-speech
Keep exploring
Frequently asked questions
- How fast is Google Gemini 3.8 Flash TTS?
- Coval does not measure Google Gemini 3.8 Flash TTS, so no latency is published here.
- How much does Google Gemini 3.8 Flash TTS cost?
- The benchmarks print a list price of $15 to $16.50 per million characters for Google Gemini 3.8 Flash TTS.
- Which languages was Google Gemini 3.8 Flash TTS tested in?
- Artificial Analysis or Speko tested Google Gemini 3.8 Flash TTS in Arabic, Chinese, French, German, Hindi, Japanese, Portuguese, Spanish, Vietnamese.