OpenAI improves GPT-5.6 Sol in ChatGPT and expands free-tier access

OpenAI announced improvements to the GPT-5.6 Sol model within ChatGPT and said it is expanding access to the model for free-tier users. The company did not specify the technical details of the changes or a rollout timeline. The update is part of OpenAI's ongoing efforts to broaden ChatGPT's availability across its user base.