GPT-5
Tracking the iterations of OpenAI's GPT-5 series, from Instant and Thinking to 5.1/5.4, we examine actual changes in inference depth, API access, and long task processing capabilities.
GPT-5 is OpenAI's flagship general-purpose model series, integrating reasoning, tool calling, and multimodal capabilities into a single system. Here, we trace the iteration from GPT-5 to GPT-5.4, examining the division of labor between Instant and Thinking, how the Responses API is integrated, and its actual performance in long tasks and complex reasoning scenarios.
