According to OpenAI (@OpenAI), recent updates to ChatGPT now make GPT-4o available by default under 'Legacy models' for all paid users. Additionally, paid users can enable the 'Show additional models' setting, granting access to legacy models such as o3, GPT-4.1, and the new GPT-5 Thinking mini. This expansion allows enterprise and business clients to tailor AI tool selection for specific use cases, optimizing productivity, workflow automation, and custom AI integration. The move underscores OpenAI's emphasis on flexible AI solutions for diverse business applications (source: OpenAI, Twitter, August 15, 2025).