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).

According to DeepLearning.AI, the instructors of the 'Reinforcement Fine-Tuning LLMs with GRPO' course are hosting a live AMA to discuss practical applications of reinforcement fine-tuning in large language models (LLMs). The session aims to provide real-world insights on how Generalized Reward Policy Optimization (GRPO) can be leveraged to enhance LLM performance, improve response accuracy, and optimize models for specific business objectives. This live AMA presents a valuable opportunity for AI professionals and businesses to learn about advanced methods for customizing AI solutions, ultimately enabling the deployment of more adaptive and efficient AI systems in industries such as finance, healthcare, and customer service (source: DeepLearning.AI Twitter, June 13, 2025).