Nox AI with Orion 2.1 Pro — The World's Most Advanced Health AI Model
Meet the Nox 2.1 generation: Orion 2.1 Pro, the newest flagship, scored 69.5 on HealthBench Professional and builds interactive 3D body models, code and MP4 videos; Orion 2.1, the same model in chat-style Plan mode with a peer-review answer pipeline; Orion Flash 2.1, the fast Orion with full thinking depth on a new 552-billion-parameter engine; and Vela 2.1 for everyday answers.
Nox opens straight into the chat: ask any health question and get an answer with Leo — Nox's medical-safety system — screening for warning signs first. Free to start, no credit card required. <a href="/chat">Open the Nox chat</a>.
Nox is an AI-powered health and wellness companion built by Xhealth, Inc. You talk to Nox in plain language — about symptoms, sleep, nutrition, medications, and everyday wellbeing — and Nox answers clearly, screens for warning signs, and helps you understand when something may need professional care.
Train smarter, feel better. Ask Nox. It plans your workouts and meals, explains your body and your bloodwork, and tells you when something needs a doctor. Nox is built for people who train, track their sleep and care about what they eat.
Questions people ask Nox
- My bloodwork came back. Can you explain what's flagged?
- My blood pressure was 138/88 at the gym. I'm 27. Is that a problem?
- I'm tired all the time, even after 8 hours of sleep. What could it be?
- I get bloated after almost every meal. What should I try?
- Work stress is wrecking my sleep. Help me wind down tonight.
- I've got a cold. Should I still train today?
Unlike typical smart-ring apps that mainly display data dashboards, Nox is designed as a conversational AI companion at the center of a smart-ring ecosystem — you talk to it, ask it health questions, and it helps you understand your body in plain language. Nox is a companion and educational tool, not a medical device, and not a replacement for a clinician.
The Nox 2 generation launched on September 23, 2026, with Orion 2, the new Orion Flash 2, and Vela 2. 1.3 Astra was retired on October 5, 2026. The Nox 2.1 family — Orion 2.1, Orion Flash 2.1 and Vela 2.1 — replaced the Nox 2 trio on October 22, 2026.
Every conversation runs on the Nox model family, and every answer passes through Leo — a safety net, not a diagnosis or a guarantee. Learn how it works and <a href="/transparency">review Nox's transparency information</a>.
Current Nox models and tools
The Nox 2.1 family: <a href="/models/orion-2.1-pro">Nox Orion 2.1 Pro</a> is the newest flagship — Orion 2.1 with tools to build interactive 3D body models, code and MP4 videos; <a href="/models/orion-2.1">Nox Orion 2.1</a> is the same model with a peer-review answer pipeline; <a href="/models/orion-flash-2.1">Orion Flash 2.1</a> is the fast Orion with full thinking depth on a new 552-billion-parameter engine and native photo input; and <a href="/models/vela-2.1">Vela 2.1</a> answers everyday questions on every plan. <a href="/models/voice-2">Nox Voice 2</a> is the voice of Nox on paid plans: it directs its own tone, follows mixed-language speech, can be interrupted with words, and saves each spoken exchange to the chat thread. Nox also offers image generation and charts, Nox's App for confirmation-first connected-app actions, and signed-in MCP integrations. <a href="/models/">Explore the Nox model family</a> or <a href="/features/">see all Nox features</a>.
Topics you can discuss with Nox
- Understanding symptoms and getting guidance on whether something may need professional care
- Getting plain-language explanations of health topics, lab results, or medications
- Building daily health plans and habits
- Managing your health routine hands-free via voice
- Getting a safety-first response — with emergency guidance surfaced — when you describe something potentially serious
- Companionship and daily check-ins around your health and wellbeing