OpenAI has officially declared the cessation of its standalone development branch for the dedicated programming model, Codex, opting instead to integrate its core functionalities into the main GPT-5.5 model. Beginning with GPT-5.4, the specialized programming branch will cease to exist, with GPT-5.3 marking the final iteration of the standalone Codex model. This strategic move signifies OpenAI's renewed focus on 'generalism.' The newly integrated GPT-5.5 showcases notable enhancements in managing programming tasks and optimizing resource utilization efficiency. Despite a roughly 20% increase in API pricing, the consumption of Tokens during programming tasks has decreased. Notably, the Codex model had previously undergone a shutdown and subsequent reintroduction; its current integration into the main model underscores the broader trend of large models transitioning from 'specialized plugin-style' to 'inherent all-in-one-style.' This development indicates that AI programming capabilities are set to become a pivotal benchmark for assessing the intelligence level of general-purpose large models.