Why it matters
- Voice agent infrastructure with real-time low-latency streaming addresses one of the hardest problems in conversational AI.
- Founded by Google engineers with deep expertise in WebRTC and real-time systems — strong technical foundation for voice.
- LLM-agnostic architecture lets agents use GPT, Claude, Gemini, or any LLM provider.
- Agent infrastructure abstracts tool use and function calling complexity from developers building conversational products.
Key capabilities
- Voice agent platform: Build real-time voice conversational agents with streaming LLM responses.
- LLM-agnostic: Connect to OpenAI, Anthropic, Google Gemini, or any LLM provider.
- Tool use / function calling: Connect agents to APIs, databases, and external services for real-time actions.
- Agent SDK: Python SDK for building and deploying custom agents.
- Hosted infrastructure: Managed hosting for agents with scaling and reliability.
- Real-time streaming: Low-latency streaming for voice and text responses.
- Corpora: Connect documents and data sources for RAG-powered knowledge retrieval.
- REST API: API for integrating Fixie agents into existing applications.
Technical notes
- SDK: Python SDK; GitHub: github.com/fixie-ai
- LLM support: OpenAI GPT, Anthropic Claude, Google Gemini, and others
- Voice: WebRTC-based voice streaming; STT/TTS pipeline
- Deployment: Fixie hosted; self-hosted via SDK
- Pricing: Free tier; paid for production scale
- Founded: 2022 by Justin Uberti and Matt Welsh; San Francisco; ex-Google
Ideal for
- Developers building real-time voice AI agents for customer service, sales, or support.
- Teams that want LLM-agnostic agent infrastructure without building the tool-use plumbing themselves.
- Applications requiring low-latency streaming AI responses for voice or chat.
Not ideal for
- No-code chatbot builders — Chatbase or CustomGPT are simpler for non-developers.
- Complex visual dialogue flow design — Voiceflow provides better visual conversation authoring.
- Teams needing the most mature enterprise chatbot platform — established providers like Google Dialogflow have more enterprise maturity.