ChatGPT is currently testing their latest model GPT-5 under the codename "Horizon Alpha" on OpenRouter. OpenRouter officially announced this new stealth model on July 30th, 2025, describing it as a cloaked model provided to the community to gather feedback. You can test it yourself at https://openrouter.ai/openrouter/horizon-alpha. They advertised ChatGPT 5 will route to different models when needed and they fulfilled that promise. When you use the character cards it routes to GPT-4o mini. I will explain character cards more in one minute, I just want to say this is undoubtedly ChatGPT 5. It admits it is by OpenAI and their latest model. It has routing to mini models, which is what was implied they would do at launch to give users unlimited access who aren't paying.
this page used to claim chatgpt 5 has a character card creator. This was an error, we deeply apologize for. OpenRouter, which is supposed to let you test specific models and their features, pushes character card into many models, without it being a model feature. That's what happened here.
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