October 2025 Summaries

Cartesia has launched Sonic-3, a new text-to-speech (TTS) technology that offers high speed and quality, including features like human-like expressivity, multilingual support across 27 languages, and fine-grained controls for speed and volume adjustments. To promote exploration and usage, a partnership with Vapi allows the community to use Sonic-3 for free from October 28 to November 2 via a managed API key, enabling unrestricted access to its production-grade voices. The technology supports natural expressiveness with emotion and laughter tags, and Vapi provides specific configuration recommendations for optimal performance, such as voice selection between Kira and Ariana for different use cases, emotion and expressivity controls for user interaction enhancement, and multilingual capabilities to cater to specific language needs.

Cartesia has introduced Sonic-3, a text-to-speech (TTS) system that sets new standards for speed and quality, offering users the opportunity to explore its capabilities through different voices and adjustable emotion and speed controls. To facilitate this exploration, a partnership with Vapi provides the community with a free week of access to Sonic-3 from October 28 to November 2, allowing users to experiment with its production-grade voices and industry-leading speed without cost constraints. Sonic-3 features human-like expressivity with emotion and laughter tags, fine-grained speed and volume control, and multilingual capabilities supporting 27 languages. Recommendations for optimal use on Vapi's platform include selecting optimized voices like Kira and Ariana, utilizing emotion and expressivity controls for more human-like interactions, and leveraging multilingual support for enhanced accuracy in specialized scenarios.