No but it's the only OpenAI model with a decisions API https://developers.openai.com/api/docs/guides/decisions

Small LLM + no reasoning + fixed JSON-only output = decision model

There's actually a decision model version of GPT-6 Luna... You are right to be confused though. OpenAI and their never ending naming games. https://openrouter.ai/openai/gpt-6-luna-decisions