Data read October 27, 2026
Gradium TTS vs ElevenLabs Flash v2.5: TTS API comparison
On P95 latency, Gradium TTS is faster: 104.3 ms for Gradium TTS against 255.1 ms for ElevenLabs Flash v2.5.
On Artificial Analysis listener Elo, Gradium TTS is ahead (1,174 for Gradium TTS, 1,076 for ElevenLabs Flash v2.5). List price per million characters: $36 to $57.80 for Gradium TTS, $40 to $50 for ElevenLabs Flash v2.5.
Gradium TTS is ranked 1 of 23; ElevenLabs Flash v2.5 is ranked 9 of 23. Every comparison on this site uses Gradium TTS as its fixed reference, and no page says either model is better overall.
| Measure | Gradium TTS | ElevenLabs Flash v2.5 | Ahead |
|---|---|---|---|
| Rank in the multilingual speed ranking | 1 | 9 | n/a |
| Speed tier | Headroom | Fast enough | n/a |
| Median time to first audio (ms), lower is faster | 53.7 | 191.0 | Gradium TTS |
| P95 time to first audio (ms), lower is faster | 104.3 | 255.1 | Gradium TTS |
| Listener Elo (Artificial Analysis) | 1,174 | 1,076 | Gradium TTS |
| Customer-service Elo (Artificial Analysis) | 1,241 | 1,089 | Gradium TTS |
| Naturalness (Speko) | 1,592 | 1,494 | Gradium TTS |
| Naturalness estimate (Cekura, 1 to 5) | 4.51 | 4.33 | Gradium TTS |
| Reading accuracy (Cekura) | 79.5% | 64.4% | Gradium TTS |
| 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 | $40 to $50 | Gradium TTS |
| Languages tested (Artificial Analysis, Speko) | 4 | 9 | ElevenLabs Flash v2.5 |
| 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 ElevenLabs Flash v2.5?
- On P95 latency, Gradium TTS is faster: 104.3 ms for Gradium TTS against 255.1 ms for ElevenLabs Flash v2.5.
- How do Gradium TTS and ElevenLabs Flash v2.5 compare on voice quality?
- On Artificial Analysis listener Elo, Gradium TTS is ahead (1,174 for Gradium TTS, 1,076 for ElevenLabs Flash v2.5).
- Which is cheaper, Gradium TTS or ElevenLabs Flash v2.5?
- List price per million characters: $36 to $57.80 for Gradium TTS, $40 to $50 for ElevenLabs Flash v2.5.