Tibo, head of Codex, announced updates improving efficiency and user experience for Codex and ChatGPT Work users, continuing OpenAI's rapid iteration on product efficiency. OpenAI passes resource savings from reasoning optimizations to subscription users, aiming to enhance the competitiveness of GPT-5.6 Sol while balancing cost and user experience through parameter adjustments. Current large model services are in a phase of post-training and reasoning efficiency competition, where context and agent adjustments directly affect paid usage. The update represents a technological substitution where reasoning optimizations and parameter fine-tuning replace high-consumption operating modes, achieving sustainable scaling through cost pass-through and limit adjustments, allowing users to gain more effective usage within the same budget.