Inspired by this article: https://www.technologyreview.com/2025/01/17/1110086/openai-has-created-an-ai-model-for-longevity-science/

Resolves to "yes" if OpenAI announces a model which has a name containing the string "GPT-4b" (case insensitive) and otherwise resolves to "no"

Releasing the model is not required for the market to resolve to "yes". It's enough that OpenAI announces that they have created such model