From reverse-engineering code to complex patent research, here are 7 prompts that push OpenAI's GPT-5.4 Extended Thinking model to its reasoning limits. OpenAI recently updated GPT-5.4 with a feature that has the tech world buzzing: Extended Thinking mode. While the base model is already lightning-fast, this new toggle allows the AI to "ruminate"—running internal simulations and self-correcting befor... [8252 chars]