Inworld's newly released Realtime TTS-2 is the new #1 on the Artificial Analysis Controlled Voice Arena, just ahead of Cartesia Sonic 3.6, and ranks #2 on our Provider Voice Arena behind Sonic 3.6
Realtime TTS-2 is a new Text to Speech model from @inworld_ai that supports over 100 languages, including English, Hindi, Spanish, French, German, Chinese, and Japanese. Language can be set explicitly or detected from the text, including multiple languages in a single request (e.g., "I'll grab a coffee. ¿Quieres uno? お疲れさま。"). It also supports delivery instructions written in plain text alongside the input (e.g., [speak tired but warm, like she just got home from a long day]).
Key takeaways:
➤ Controlled Voice: Realtime TTS-2 takes #1 on the Controlled Voice Arena with an Elo of 1,123 (+16/-16) across 1,292 appearances, 4 points ahead of Cartesia's Sonic 3.6 at 1,119. Sonic 3.5 follows at 1,096, then Inworld’s own Realtime TTS-2 Flash - Research Preview at 1,075, and ElevenLabs Eleven v3 at 1,062
➤ Provider Voice: Realtime TTS-2 takes #2 on the Provider Voice Arena with an Elo score of 1,252 (+18/-18) based on 1,094 arena appearances, placing it ahead of Alibaba Qwen-Audio-3.0-TTS-Plus at 1,241 and Speechify Simba 3.2 at 1,240, but behind Sonic 3.6 at 1,282
➤ Throughput: The model processes 106 characters per second of generation time, compared to 124 for Sonic 3.6, 97 for Simba 3.2, and 40 for Eleven v3
➤ Pricing: Realtime TTS-2 is priced at $20.83 per 1M characters, lower priced than Sonic 3.6 ($49), Eleven v3 ($100), and Qwen-Audio-3.0-TTS-Plus ($27.59), but more expensive than Simba 3.2 ($10)
See more details and listen to samples in the thread below ⬇️
Realtime TTS-2 takes #2 on the Provider Voice Arena with an Elo score of 1,252 (+18/-18) based on 1,094 arena appearances, placing it ahead of Alibaba Qwen-Audio-3.0-TTS-Plus at 1,241 and Speechify Simba 3.2 at 1,240, but behind Cartesia Sonic 3.6 at 1,282.
Sample prompt on Realtime TTS-2: “I've had a look at your booking and it looks like the cancellation fee would normally apply, but given the circumstances we're happy to waive that for you this time.”
Sample prompt on Realtime TTS-2: “Revenue from the capital markets business, which houses its trading desks, rose 7.1% to $892.2 million from the previous quarter.”
Realtime TTS-2 tops the Controlled Voice Arena at 1,123 Elo while costing $20.83 per million characters against $49 for Sonic 3.6 and $100 for Eleven v3, and it accepts plain text delivery instructions and mixed languages in one request.
Read the full thread on X ↗
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