{"slug": "introducing-voice-personas", "title": "Introducing Voice Personas", "summary": "Sierra launched Voice Personas, a feature that lets AI agents adopt distinct brand voices and personalities across languages and markets, separating an agent's function from its expression. The company reports that pairing a natural voice with a persona increased resolution rates by almost 50 percent for one agent, and its platform now handles billions of customer interactions annually. Voice Personas are available today on Sierra.", "body_md": "# Introducing Voice Personas\n\nWhat an agent does and how it expresses itself are two different things. Today, we’re launching Voice Personas so you can design both.\n\nWhen we launched Sierra two and a half years ago, the fact that an AI agent could have a phone call was remarkable. Now, our customers have built agents that are handling billions of customer interactions and driving billions of dollars of revenue every year.\n\nAI agents are clearly becoming the digital front for our companies. How do we take the next step in making those interactions feel as distinct and differentiated as each of our brands?\n\nPersonas lets you build your own brand voice. With Personas, you can give your AI agent not just a multilingual voice, but an entire personality. It can be polite, snarky, casual, formal, funny, or serious — in a way that you deeply control and uniquely represents your brand values.\n\nA persona isn’t simply a voice or a prompt telling an agent to “sound empathetic.” It combines voice, personality, and language-aware behavior into one coherent experience. You build the underlying agent once, then give it different personas for different brands, markets, and experiences.\n\nThe best way to understand Personas is to hear them. Here’s a video with a sample of some of our favorites so far:\n\n## One agent, many personalities\n\nWhat your agent does often needs to be consistent whatever the channel, language or country. A retailer’s return policy doesn’t change depending on who is asking.\n\nBut how an agent communicates can.\n\nOne brand might want an agent that is calm, measured, and reassuring. Another might want one that is energetic, conversational, and optimistic. Both can follow exactly the same policies and take exactly the same actions while creating very different customer experiences.\n\nThe same principle applies across cultures.\n\nNext, the leading UK retailer, has an agent live in 83 countries and 20 languages. The challenge at that scale isn’t simply translation.\n\nExpectations around formality, pacing, vocabulary, and conversational style vary around the world. Voice Personas lets a company adapt the interaction itself — without building a different agent for every market.\n\n## More than a voice\n\nVoice is how a persona comes to life, but Voice Personas goes beyond choosing an accent or a particular character.\n\nThe agent itself can control how it speaks. New capabilities in the Sierra Agent SDK let agents adjust pacing, respond naturally to interruptions, and even switch voices or languages in the middle of a conversation.\n\nUnderneath, every persona is powered by a [constellation of voice models](https://sierra.ai/blog/constellation-of-models). Sierra uses the model that performs best for a particular persona, language, and use case, continuously benchmarking leading models as the technology evolves. Voices are sealed in production, so the experience you test is the experience your customers hear.\n\nAnd Voice Personas are integrated with Sierra’s [simulation and evaluation infrastructure](https://sierra.ai/blog/voice-sims-test-agents-in-real-world-conditions-before-they-talk-to-your-customers). Teams can test personas against thousands of simulated customer interactions before deploying them, or A/B test different personalities and voices based on the outcomes they produce.\n\nThose differences can be significant. For one agent, pairing a natural voice with a persona increased resolution rates by almost 50 percent.\n\n## Personality without compromise\n\nAs voice AI improves, it’s easy to focus on making agents sound more human. We think the bigger opportunity is making them feel like your company.\n\nBy separating what an agent does from how it communicates, one highly effective agent can represent your brand while adapting to different customers, cultures, and markets around the world.\n\nWhile the job stays the same, the personality can change. Voice Personas are available today on Sierra.", "url": "https://wpnews.pro/news/introducing-voice-personas", "canonical_source": "https://sierra.ai/blog/introducing-voice-personas", "published_at": "2026-08-07 18:00:00+00:00", "updated_at": "2026-08-09 09:35:05.424773+00:00", "lang": "en", "topics": ["artificial-intelligence", "ai-products", "generative-ai", "natural-language-processing"], "entities": ["Sierra", "Next"], "alternates": {"html": "https://wpnews.pro/news/introducing-voice-personas", "markdown": "https://wpnews.pro/news/introducing-voice-personas.md", "text": "https://wpnews.pro/news/introducing-voice-personas.txt", "jsonld": "https://wpnews.pro/news/introducing-voice-personas.jsonld"}}