By skyforbes Here's a quick summary.
Claude: XML
Gemini: Business instructions
ChatGPT: Markdown
Grok: Natural language bullet points
Perplexity: Markdown is a general-purpose format because it allows for model switching
Qwen: Chinese instructions (short, up to 500 characters)
PrimeIntellect, GLM, DeepSeek, Kimi: No pre-prompt setting