TTS alternatives · 2026
Best Cartesia alternatives for real-time TTS
The overall benchmark without Cartesia's 3 models: the text-to-speech APIs to consider instead, on the same rules (latency, voice quality, accuracy and price). Cartesia's best model is shown first as the reference.
| Model | Score /100 | P50 TTFA (Coval) | P99 TTFA (Coval) | Arena Elo (AA) | Price / 1M chars (AA) |
|---|---|---|---|---|---|
| Cartesia Sonic 3.5 Cartesia · reference | 58.5 | 280 ms | 421.8 ms | 1187 | 49 USD |
| Gradium TTS Beta Gradium · rank 1 | 76.8 | 47.2 ms | 108.8 ms | not rated | not published |
| Alibaba Qwen3 TTS Fast Alibaba (Qwen) · rank 2 | 73.7 | 64.6 ms | 125.3 ms | not rated | not published |
| Soniox TTS Real-Time v2 Soniox · rank 2 | 73.7 | 245.6 ms | 343.4 ms | 1175 | 14.2 USD |
| Inworld Realtime TTS-2 Inworld · rank 4 | 68.8 | 163.1 ms | 293.7 ms | 1247 | 20.8 USD |
| Inworld Realtime TTS-2 Flash Inworld · rank 5 | 68.4 | 69.4 ms | 175.2 ms | 1209 | 10.4 USD |
| Gradium TTS (Aug 2026) Gradium · rank 6 | 59.6 | 213.5 ms | 382.5 ms | 1149 | 47.2 USD |
| Palabra TTS v1 Palabra · rank 7 | 58.6 | 105 ms | 299.8 ms | not rated | not published |
| Soniox TTS RT v1 Soniox · rank 9 | 57.2 | 247.2 ms | 339.8 ms | not rated | not published |
| ElevenLabs Eleven v3 Conversational ElevenLabs · rank 10 | 56.8 | 323.1 ms | 497.7 ms | 1200 | 50 USD |
| ElevenLabs Flash v2.5 ElevenLabs · rank 11 | 56.1 | 184.8 ms | 332.4 ms | 1076 | 50 USD |
Head to head: Gradium TTS Beta vs Cartesia Sonic 3.5 · real-time ranking on speed only
Frequently asked questions
- What is the best alternative to Cartesia for real-time text-to-speech?
- In the 2026 benchmark, the best-ranked model not made by Cartesia is Gradium TTS Beta (Gradium), 76.8/100, with a P50 time-to-first-audio of 47.2 ms on Coval. Cartesia's best model, Cartesia Sonic 3.5, scores 58.5.
- Which TTS APIs have lower latency than Cartesia?
- 14 models from other providers have a lower P50 time-to-first-audio than Cartesia Sonic 3.5 (280 ms) on Coval's 30-day window ending October 1, 2026, led by Gradium TTS Beta (47.2 ms), Alibaba Qwen3 TTS Fast (64.6 ms), Soniox TTS Real-Time v2 (245.6 ms).
- Are there cheaper alternatives to Cartesia?
- Cartesia Sonic 3.5 is listed at 49 USD per 1M characters by Artificial Analysis. Among the 10 alternatives below, 4 are listed lower: Soniox TTS Real-Time v2 (14.2 USD), Inworld Realtime TTS-2 (20.8 USD), Inworld Realtime TTS-2 Flash (10.4 USD), Gradium TTS (Aug 2026) (47.2 USD).
- How are these Cartesia alternatives ranked?
- With the same rules as the overall benchmark: real-time speed, voice quality, accuracy and price, from Coval, Speko and Artificial Analysis. Cartesia's own models are simply removed from the list.