Claude Sonnet 4 is now available in Conversational AI

Anthropic's new Claude Sonnet 4 model is now available on the ElevenLabs platform.

If you've been hitting the limits of what your voice agents can do, this is an upgrade you'll want to check out. Sonnet 4 is engineered for the kind of complex, multi-turn interactions that make an AI feel genuinely intelligent. We’ve integrated it to give you a powerful new tool for building more capable and intuitive voice experiences.

What this means for your agents

We know building great voice AI is hard. Sonnet 4 directly addresses some of the biggest challenges.

• Improved instruction following: You know the frustration of an agent missing a step in a multi-part command? Sonnet 4 is exceptionally good at following complex instructions. This means you can design more sophisticated conversational flows that just work, without needing elaborate workarounds.

• Speed and intelligence in one package: For voice, latency is everything. An agent that's smart but slow is unusable. Sonnet 4 is built for this exact challenge. It's fast enough for real-time, responsive conversation while delivering benchmark scores that rival top-tier models like OpenAI's o3. You no longer have to choose between a model that's quick and one that's powerful—Sonnet 4 gives you both.

• Smarter conversations with better context: Sonnet 4 has a significantly improved ability to maintain context over longer dialogues. You can build agents that "remember" key details from earlier in the conversation. No more users having to repeat themselves. This unlocks more natural, less robotic interactions and makes personalized experiences much easier to implement.

• Reliable tool use: Your agent is probably calling a few APIs to get things done. Sonnet 4 excels at reliably using tools to interact with external systems. This allows for the creation of dynamic, efficient agents that can check flight statuses, manage bookings, and access customer records within a fluid conversation.

Why it matters

For you, the developer, this means:

• Less time on workarounds: Spend more time building features and less time trying to force a model to follow complex logic.
• Truly conversational apps: Build voice agents that can handle genuinely useful, real-world tasks without the awkward pauses and delays that kill the user experience.

• Happier users: Create conversational experiences that are not only intelligent but also fluid and natural, leading to better engagement.

Ready to try it out?

Head to the Conversational AI section in your ElevenLabs dashboard.

When you create or edit an agent, just select Claude Sonnet 4 from the Language Model dropdown.

Deploy with a single line of HTML or with our SDKs. That's it.

You can start building with Claude Sonnet 4 today. We're excited to see what you create with it.