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).

According to Sam Altman (@sama), ChatGPT has introduced new user-selectable modes for GPT-5: 'Auto', 'Fast', and 'Thinking'. This feature enables users to tailor their AI experience based on speed and depth of reasoning, with 'Auto' as the default and additional granular control for advanced users. The update also raises rate limits to 3,000 messages per week for the 'Thinking' mode, with extra capacity available, significantly enhancing productivity and scalability for enterprise and power users. These enhancements present new business opportunities for AI-driven workflows, allowing organizations to optimize response times and computational resources for varied use cases (source: Sam Altman, Twitter, August 13, 2025).