Data read October 27, 2026
Gradium TTS vs SpeechifyAI Simba 3.0: TTS API comparison
On P95 latency, Gradium TTS is faster: 104.3 ms for Gradium TTS against 149.4 ms for SpeechifyAI Simba 3.0.
On Artificial Analysis listener Elo, Gradium TTS is ahead (1,174 for Gradium TTS, 1,116 for SpeechifyAI Simba 3.0). List price per million characters: $36 to $57.80 for Gradium TTS, $6.60 to $10 for SpeechifyAI Simba 3.0.
Gradium TTS is ranked 1 of 23; SpeechifyAI Simba 3.0 is ranked 5 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 | SpeechifyAI Simba 3.0 | Ahead |
|---|---|---|---|
| Rank in the multilingual speed ranking | 1 | 5 | n/a |
| Speed tier | Headroom | Fast enough | n/a |
| Median time to first audio (ms), lower is faster | 53.7 | 100.5 | Gradium TTS |
| P95 time to first audio (ms), lower is faster | 104.3 | 149.4 | Gradium TTS |
| Listener Elo (Artificial Analysis) | 1,174 | 1,116 | Gradium TTS |
| Customer-service Elo (Artificial Analysis) | 1,241 | 1,130 | Gradium TTS |
| Naturalness (Speko) | 1,592 | n/a | n/a |
| 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 | n/a | n/a |
| Lowest list price per 1M characters (lower is cheaper) | $36 to $57.80 | $6.60 to $10 | SpeechifyAI Simba 3.0 |
| Languages tested (Artificial Analysis, Speko) | 4 | 4 | Tie |
| 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 SpeechifyAI Simba 3.0?
- On P95 latency, Gradium TTS is faster: 104.3 ms for Gradium TTS against 149.4 ms for SpeechifyAI Simba 3.0.
- How do Gradium TTS and SpeechifyAI Simba 3.0 compare on voice quality?
- On Artificial Analysis listener Elo, Gradium TTS is ahead (1,174 for Gradium TTS, 1,116 for SpeechifyAI Simba 3.0).
- Which is cheaper, Gradium TTS or SpeechifyAI Simba 3.0?
- List price per million characters: $36 to $57.80 for Gradium TTS, $6.60 to $10 for SpeechifyAI Simba 3.0.