28th September 2025
We’ve seen the strong reactions to 4o responses and want to explain what is happening.
We’ve started testing a new safety routing system in ChatGPT.
As we previously mentioned, when conversations touch on sensitive and emotional topics the system may switch mid-chat to a reasoning model or GPT-5 designed to handle these contexts with extra care. This is similar to how we route conversations that require extra thinking to our reasoning models; our goal is to always deliver answers aligned with our Model Spec.
Routing happens on a per-message basis; switching from the default model happens on a temporary basis. ChatGPT will tell you which model is active when asked.
— Nick Turley, Head of ChatGPT, OpenAI
Recent articles
- Changes in the system prompt between Claude Opus 4.6 and 4.7 - 18th April 2026
- Join us at PyCon US 2026 in Long Beach - we have new AI and security tracks this year - 17th April 2026
- Qwen3.6-35B-A3B on my laptop drew me a better pelican than Claude Opus 4.7 - 16th April 2026