OpenAI has released two new "chain-of-thought" models, o1-preview and o1-mini, which prioritize reasoning over speed and cost. These models are trained to think step-by-step, enabling them to handle more complex prompts requiring backtracking and deeper analysis. While the reasoning process is hidden from users due to safety and competitive advantage concerns, it allows for improved results in tasks like generating Bash scripts, solving crossword puzzles, and validating data.