Leo is retired

Leo, Nox's dedicated medical-safety layer, is retired as of November 2026. The Nox models now handle careful, safety-aware health answers on their own, so a separate Leo layer is no longer necessary. Nox still shows an emergency alert with local emergency numbers when a message describes a possible emergency.

Why we retired Leo

Leo was built when health answers needed an extra layer of care around the model. The Nox models have since reached a level where they give careful, safety-aware health answers on their own — including telling you when something needs a doctor — so a separate Leo layer is no longer necessary.

What changed

The Leo strictness levels (relaxed, standard and strict) are gone from the composer and from Settings, and Nox no longer runs a separate AI safety check on your messages. There is nothing you need to change — older app versions keep working.

What stays

Nox still shows an emergency alert, with your local emergency numbers, when a message describes a possible emergency. This is basic, keyword-based detection: it runs before the answer, it can miss emergencies that are worded unusually, and it is not a guarantee. Set your region in Settings so the alert shows the right number.

Still important

• Nox is not a substitute for a doctor, and it does not diagnose, treat or prescribe.
• Nox is not an emergency service. The emergency alert is a basic safety notice, not a guarantee.
• If you think you may be experiencing a medical emergency, call your local emergency number right away.