{"slug": "cartesia-packages-sonic-3-5-and-ink-2-into-a-full-voice-agent-stack", "title": "Cartesia packages Sonic-3.5 and Ink-2 into a full voice-agent stack", "summary": "Cartesia CEO Karan Goel announced the integration of Sonic 3.5 for text-to-speech and Ink 2 for speech-to-text into a unified voice-agent stack, claiming the company is now the only provider with models for both speaking and listening in live voice agent loops.", "body_md": "Karan Goel (@krandiash) is turning Cartesia's May model releases into a broader platform push: Sonic 3.5 for text to speech, Ink 2 for speech to text, and a claim that Cartesia can now own both sides of the live voice agent loop. \"We're now the only provider to have 1 models for both speaking and listening,\" Goel wrote in a post on X on Monday, June 15. That framing is aggressive, and it needs the timestamp attached. Cartesia's own documentation lists the stable Sonic 3.5 snapshot as released...", "url": "https://wpnews.pro/news/cartesia-packages-sonic-3-5-and-ink-2-into-a-full-voice-agent-stack", "canonical_source": "https://runtimewire.com/article/cartesia-sonic-35-ink-2-voice-agent-benchmarks", "published_at": "2026-06-15 22:44:30+00:00", "updated_at": "2026-06-15 22:52:22.627061+00:00", "lang": "en", "topics": ["artificial-intelligence", "ai-products", "ai-tools", "ai-startups", "natural-language-processing"], "entities": ["Cartesia", "Karan Goel", "Sonic 3.5", "Ink 2"], "alternates": {"html": "https://wpnews.pro/news/cartesia-packages-sonic-3-5-and-ink-2-into-a-full-voice-agent-stack", "markdown": "https://wpnews.pro/news/cartesia-packages-sonic-3-5-and-ink-2-into-a-full-voice-agent-stack.md", "text": "https://wpnews.pro/news/cartesia-packages-sonic-3-5-and-ink-2-into-a-full-voice-agent-stack.txt", "jsonld": "https://wpnews.pro/news/cartesia-packages-sonic-3-5-and-ink-2-into-a-full-voice-agent-stack.jsonld"}}