OpenAI has introduced a new model, with some outlets specifying versions such as GPT-5, GPT-5.1, GPT-5.4, and GPT-5.5, which is expected to be faster and smarter. The new model is said to feature improvements including a warmer tone, faster reasoning, and custom personality options. However, there is some uncertainty about the specific version and its capabilities, with some reports mentioning different versions and features, including a separate Spark model.