The highest-value use cases for mechanical engineers are not calculations or geometry — they are the repetitive writing, structured thinking, and communication tasks that surround design work. Based on CoLab's experience working alongside engineering teams at leading manufacturers, the three categories where ChatGPT delivers the most reliable results are brainstorming failure modes before a design review, drafting technical documentation like test report summaries and revision comparison notes, and streamlining professional communication with suppliers and leadership. These tasks play to ChatGPT's strength as a language model while avoiding the areas where it fails — arithmetic, deterministic analysis, and anything requiring access to your actual CAD data.