11x
11x partners with Cartesia to redefine the future of work
"In 1999, Salesforce brought software to the cloud. In 2025, 11x is killing software as we know it and unleashing the era of digital workers. To realise this vision, we needed AI voice technology that feels truly human. Cartesia’s technology gives our AI digital workers reps the speed, reliability, and natural expressiveness required to engage customers at scale.
It's the only solution fit for our relentless drive toward innovation.”
Keith Fearon, Head of Product & Growth, 11x
About the company
11x is the category creator and leader of AI digital workers. Instead of traditional software, 11x deploys autonomous AI agents acting as 24/7 team members, managing sales and go-to-market tasks from start to finish.
Backed by leading investors like Andreessen Horowitz and Benchmark, 11x has secured over $76M in funding. It plans to launch up to 20 new AI agents in the coming year, redefining the future of work.
Their flagship digital workers include Alice, the world’s first AI SDR, and now Julian, an AI voice agent purpose-built for go-to-market teams, accelerating speed-to-lead, qualification, and re-engagement by serving as a tireless extension of your sales team through intelligent, human-like phone conversations.
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The Challenge
11x needed a voice solution that could meet the demanding requirements of their new digital worker Julian, whose key differentiator is that he's more than just another generic voice agent. Julian is trained on hundreds of thousands of real-world calls to become the world's best go-to-market dialer.
Given the persuasive and real-time nature of sales, 11x needed voice technology that was both reliable with low latency and exceptionally natural and expressive. Recognizing that most potential customers are busy and quick to dismiss sales calls, 11x knew that even minor inaccuracies or unnatural speech patterns could undermine trust in their digital workers—directly impacting engagement rates and revenue. After evaluating multiple options, 11x found their answer in Cartesia.
The Solution
Cartesia's voice AI technology enables 11x to build digital workers that customers can trust. With cutting-edge advancements in generative voice, Cartesia delivers:
Enterprise-Ready Performance – Designed for high-volume sales operations, handling thousands of concurrent calls with consistent clarity, responsiveness, and reliability.
Ultra-Low Latency – Built on state space models (SSMs), Cartesia delivers industry-leading response times under 100ms, ensuring natural, real-time conversations that keep prospects engaged and reduce dropped calls.
Superior Voice Quality – With access to 200+ ultra-realistic voices, AI sales agents communicate with persuasive, expressive, and confident tones—matching the effectiveness of top human dialers at scale.
Fine-Grained Voice Control—Unlike any other provider, Cartesia enables precise voice customization. Digital workers can dynamically adjust speed, emotion, and tone, whether adapting to an impatient prospect or handling an objection with warmth and professionalism.
Human-Like Conversational Intelligence – Cartesia-powered AI sales reps manage complex sales dialogues, ensuring smooth, engaging, and effective sales experiences.
By integrating Cartesia, 11x ensures that its digital workers communicate naturally and create meaningful conversations—enhancing engagement, trust, and revenue generation at scale.
"11x is redefining the future of work with AI-powered digital workers, and we’re proud to power their voice. Their vision demands the most natural, responsive, and adaptable voice AI—one that can engage customers with the same nuance and effectiveness as a top sales rep. With Cartesia, 11x is setting a new standard for AI-driven sales, and together, we’re proving what’s possible when cutting-edge voice technology meets bold innovation."
Karan Goel, CEO, Cartesia
What our customers say
Join the growing list of companies opting for Sonic.
"Before conversational voice models like Cartesia, Thoughtly relied on legacy text-to-speech APIs from major cloud providers. Nearly two years later, the evolution of this technology is staggering—customers can clone their voice and hear it speaking autonomously over the phone in just 60 seconds.”
Torrey Leonard, CEO, Thoughtly
"Using Cartesia's generative voice API, Sonic, we’ve strengthened Cresta AI Agent to move beyond rigid scripts and towards delivering empathetic, human-like conversations that accurately represent customer brands and their commitment to excellent customer service. Sonic empowers Cresta AI Agent to resolve complex issues effortlessly, helping our customers gain real value from their AI investment and significantly improve their NPS and CSAT scores."
Tim Shi, Co-Founder & Chief Technology Officer at Cresta
"This partnership represents a transformative moment in enterprise AI adoption. By combining Rasa’s strengths in enterprise conversational AI with Cartesia's innovative voice technology, we're fundamentally changing how enterprises can deploy and scale AI assistants across their organizations."
Melissa Gordon, CEO of Rasa
