Data read October 27, 2026
Gradium TTS vs Google Gemini 3.8 Flash TTS: TTS API comparison
Speed cannot be compared: Coval does not measure Google Gemini 3.8 Flash TTS, so it has no P95 here.
On Artificial Analysis listener Elo, Google Gemini 3.8 Flash TTS is ahead (1,174 for Gradium TTS, 1,280 for Google Gemini 3.8 Flash TTS). List price per million characters: $36 to $57.80 for Gradium TTS, $15 to $16.50 for Google Gemini 3.8 Flash TTS.
Gradium TTS is ranked 1 of 23; Google Gemini 3.8 Flash 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 | Google Gemini 3.8 Flash TTS | Ahead |
|---|---|---|---|
| Rank in the multilingual speed ranking | 1 | not ranked | n/a |
| Speed tier | Headroom | n/a | n/a |
| Median time to first audio (ms), lower is faster | 53.7 | n/a | n/a |
| P95 time to first audio (ms), lower is faster | 104.3 | n/a | n/a |
| Listener Elo (Artificial Analysis) | 1,174 | 1,280 | Google Gemini 3.8 Flash TTS |
| Customer-service Elo (Artificial Analysis) | 1,241 | 1,341 | Google Gemini 3.8 Flash TTS |
| Naturalness (Speko) | 1,592 | 1,642 | Google Gemini 3.8 Flash 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 | 89.5% | n/a |
| Lowest list price per 1M characters (lower is cheaper) | $36 to $57.80 | $15 to $16.50 | Google Gemini 3.8 Flash TTS |
| Languages tested (Artificial Analysis, Speko) | 4 | 9 | Google Gemini 3.8 Flash 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 Google Gemini 3.8 Flash TTS?
- Speed cannot be compared: Coval does not measure Google Gemini 3.8 Flash TTS, so it has no P95 here.
- How do Gradium TTS and Google Gemini 3.8 Flash TTS compare on voice quality?
- On Artificial Analysis listener Elo, Google Gemini 3.8 Flash TTS is ahead (1,174 for Gradium TTS, 1,280 for Google Gemini 3.8 Flash TTS).
- Which is cheaper, Gradium TTS or Google Gemini 3.8 Flash TTS?
- List price per million characters: $36 to $57.80 for Gradium TTS, $15 to $16.50 for Google Gemini 3.8 Flash TTS.