According to @sama, ChatGPT now offers three GPT-5 modes — Auto, Fast, and Thinking — with most users expected to use Auto while added control will help some users (source: @sama on X, Aug 13, 2025). Rate limits are set at 3,000 messages per week for GPT-5 Thinking, with mention of extra capacity on GPT-5 Thinking (source: @sama on X, Aug 13, 2025). Traders can base near-term positioning on these confirmed usage parameters and feature availability communicated by OpenAI leadership (source: @sama on X, Aug 13, 2025).