Data read October 27, 2026
Gradium TTS vs Rime Coda: TTS API comparison
On P95 latency, Gradium TTS is faster: 104.3 ms for Gradium TTS against 428.1 ms for Rime Coda.
On Artificial Analysis listener Elo, Gradium TTS is ahead (1,174 for Gradium TTS, 1,054 for Rime Coda). List price per million characters: $36 to $57.80 for Gradium TTS, $50 for Rime Coda.
Gradium TTS is ranked 1 of 23; Rime Coda is ranked 16 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 | Rime Coda | Ahead |
|---|---|---|---|
| Rank in the multilingual speed ranking | 1 | 16 | n/a |
| Speed tier | Headroom | Visible delay | n/a |
| Median time to first audio (ms), lower is faster | 53.7 | 317.5 | Gradium TTS |
| P95 time to first audio (ms), lower is faster | 104.3 | 428.1 | Gradium TTS |
| Listener Elo (Artificial Analysis) | 1,174 | 1,054 | Gradium TTS |
| Customer-service Elo (Artificial Analysis) | 1,241 | 1,108 | Gradium TTS |
| Naturalness (Speko) | 1,592 | 1,535 | Gradium TTS |
| Naturalness estimate (Cekura, 1 to 5) | 4.51 | 4.42 | Gradium TTS |
| Reading accuracy (Cekura) | 79.5% | 76.7% | 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 | $50 | Gradium TTS |
| Languages tested (Artificial Analysis, Speko) | 4 | 1 | 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 Rime Coda?
- On P95 latency, Gradium TTS is faster: 104.3 ms for Gradium TTS against 428.1 ms for Rime Coda.
- How do Gradium TTS and Rime Coda compare on voice quality?
- On Artificial Analysis listener Elo, Gradium TTS is ahead (1,174 for Gradium TTS, 1,054 for Rime Coda).
- Which is cheaper, Gradium TTS or Rime Coda?
- List price per million characters: $36 to $57.80 for Gradium TTS, $50 for Rime Coda.