# fixie.ai

> AI-optimized mirror of fixie.ai containing 22 pages totalling 28,628 words of clean markdown content, structured data, and semantic HTML. Original source: https://fixie.ai/. Last updated: 2026-04-20T02:40:45.142Z.

Each page is available as HTML (with JSON-LD structured data) and Markdown (text-only, ideal for LLMs and RAG).

## Homepage

- [Speech-Native](/site-root.html): Ultravox is a real-time voice AI infrastructure layer that powers fast, natural, and scalable voice agents. (631 words)
- [Developer-friendly APIs. Agentic-ready primitives. Human-like conversations. Join thousands of teams building natural, conversational voice AI experiences.](/site-root.html): Ultravox is a real-time voice AI infrastructure layer that powers fast, natural, and scalable voice agents. (632 words)

## Articles & Blog Posts

- [How 11x Outsourced Voice AI Innovation to Dominate Their Market](/case-studies/how-11x-outsourced-voice-ai-innovation-to-dominate-their-market.html): Ultravox is a real-time voice AI infrastructure layer that powers fast, natural, and scalable voice agents. (503 words)
- [blog/why-speech-to-speech-is-the-future-for-ai-voice-agents-unpacking-the-aiewf-eval.html](/blog/why-speech-to-speech-is-the-future-for-ai-voice-agents-unpacking-the-aiewf-eval.html) (1 words)
- [terms/index.html](/terms/index.html) (1 words)
- [privacy/index.html](/privacy/index.html) (1 words)
- [Voice AI Trends for 2026](/blog/voice-ai-trends-for-2026/index.html): A developer-focused look at the trends shaping voice AI in 2026 — from emotional AI and agentic automation to multimodal interfaces and edge architectures. (1,669 words)
- [Ultravox: An open-weight alternative to GPT-4o Realtime](/blog/ultravox-an-open-weight-alternative-to-gpt-4o-realtime.html): Today we’re thrilled to introducing Ultravox v0.4.1, a family of multi-modal, open-source models trained specifically for enabling real-time conversations with AI.  (1,112 words)
- [Introducing Ultravox v0.5: Taking the Lead in Speech Understanding](/blog/ultravox-v0-5-taking-the-lead-in-speech-understanding.html): This latest release brings significant improvements in speech understanding, multilingual support, and real-world adaptability.  (867 words)
- [Ultravox Answers: How does zero-shot voice cloning work?](/blog/ultravox-answers-how-does-zero-shot-voice-cloning-work.html): The short answer is that there are lots of reasons why your voice clone might sound noticeably different from your actual voice–some of these are easy to fix, while others are due to more structural nuances of how voice cloning and text-to-speech models work. (1,272 words)
- [Meet Ultravox: Real-World Voice Intelligence, At Scale](/blog/meet-ultravox-real-world-voice-intelligence-at-scale.html): Ultravox has been our full time focus for the past couple of years, so we’re excited to fully step into our new name. (974 words)
- [UltraVAD is now open source! Introducing the first context-aware, audio-native endpointing model](/blog/ultravad-is-now-open-source-introducing-the-first-context-aware-audio-native-endpointing-model.html): UltraVAD, our version of a smart endpointing model that we use for running production to Ultravox Realtime, is now open source! (966 words)
- [Context-aware, audio-native endpointing: How we built UltraVAD](/blog/context-aware-audio-native-endpointing-how-we-built-ultravad.html): We recently announced that we're open sourcing UltraVAD, the smart endpointing model that we use for running production traffic in Ultravox Realtime. (1,039 words)
- [Introducing Ultravox v0.7, the world’s smartest speech understanding model](/blog/introducing-ultravox-v0-7-the-world-s-smartest-speech-understanding-model.html): Today we’re excited to release the newest version of the Ultravox speech model, Ultravox v0.7. (670 words)
- [What we need to make voice AI fully agentic](/blog/what-we-need-to-make-voice-ai-fully-agentic/index.html): There’s been an explosion of Voice AI “agents” over the past couple of years, but the truth is that there is very little agentic about them. (838 words)
- [Why Speech-to-Speech is the Future of Voice AI](/blog/why-speech-to-speech-is-the-future-of-voice-ai/index.html): The voice AI industry is being built on deprecated architecture. (928 words)
- [Thank You for an Incredible 2025](/blog/thank-you-for-an-incredible-2025/index.html): Thank you for building with Ultravox, for pushing us to be better, and for being part of what has been, frankly, a mind-blowing year.  (435 words)
- [Jan 16, 2026](/blog/introducing-the-ultravox-integration-for-pipecat/index.html): Ultravox Realtime is now available as a speech-to-speech service in Pipecat. Use the deployment stack you’re used to with a model that accepts no compromise. (538 words)
- [Inworld TTS 1.5 Voices Are Now Available in Ultravox Realtime](/blog/inworld-tts-1-5-voices-are-now-available-in-ultravox-realtime.html): Ultravox Realtime now allows users to build natural, conversational agentic experiences using pre-built and custom voices using Inworld TTS 1.5. (424 words)
- [Beyond the orchestrator: The evolution of Voice AI](/about/index.html): Ultravox is a real-time voice AI infrastructure layer that powers fast, natural, and scalable voice agents. (230 words)
- [Pricing Plans](/pricing/index.html): Ultravox is a real-time voice AI infrastructure layer that powers fast, natural, and scalable voice agents. (165 words)
- [Blog](/blog/index.html): Ultravox is a real-time voice AI infrastructure layer that powers fast, natural, and scalable voice agents. (14,732 words)

## Resources

- [Full Page Index](/index.html): Browse all cached pages with rich metadata
- [About This Cache](/content/about.html): Methodology, technical details, and usage guidelines
- [XML Sitemap](/content/sitemap.xml): Machine-readable sitemap for crawler discovery
- [Robots.txt](/content/robots.txt): Crawler directives