Sonic-3.6 at a glance
Sonic-3.6 improves naturalness over Sonic-3.5, covers 44 languages and 61 locales, and replies in under 90 ms, according to Cartesia.
What changed with Sonic-3.6
Cartesia released Sonic-3.6 on August 27, 2026. The company says it beats Sonic-3.5 on naturalness and quality, with better US English intonation and emotional delivery, stronger accent retention in instant voice clones, Hindi-English code-switching, and a locale field for reading dates, times, and numbers correctly.
The model covers 44 languages and 61 locales, adds Odia and Urdu, and offers more than 500 preset voices. Cartesia reports replies in under 90 ms and first place on Artificial Analysis's controlled voice leaderboard with 1120 Elo at the time of the post; these figures are vendor-reported.
Where to compare Sonic-3.6
Independent leaderboards and official resources for comparing this model yourself. Rankings change often; each site shows its own current data.
General leaderboards
Official resources
Why Sonic-3.6 matters for businesses
Sonic-3.6 is generally available in Cartesia's playground and API, with a 99.9% uptime SLA, deployment through Baseten, Amazon SageMaker, or Together AI, and SOC 2, PCI, HIPAA, and GDPR coverage. Those compliance options matter for agencies deploying voice agents in healthcare or payments.
Put it to work: AI Voice Agents
Sources for this story
- Introducing Sonic-3.6 (opens in a new tab)Official
Cartesia · cartesia.ai
Last verified: . IA Compa summarizes public announcements for business readers. We are not affiliated with the companies mentioned. Always confirm details, pricing, and availability with the official source.
- #text-to-speech
- #cartesia
- #voice-agents
- #multilingual
