Excited to launch GPT-5 on OpenRouter! 🧠dynamic reasoning ("think hard about this!") 🧑‍💻 much better frontend design and debugging 🏥 OpenAI's best model for health-related questions Details 👇

GPT-5 replaces the Horizon Alpha and Beta stealth models on OpenRouter. They were early checkpoints in the GPT-5 family of models.

GPT-5 comes in four variants. See them all here: 1. GPT-5 Chat:

2. GPT-5 (BYOK-only for the API, open access in the chatroom):

3. GPT-5 Mini:

4. GPT-5 Nano:

Let us know what you *think*