GPT-5.5 Prompt Engineering

GPT-5.5 rewards prompts that define the outcome before the process. Lead with success criteria, then specify reasoning depth and output shape. This guide follows OpenAI’s official GPT-5.5 guidance: start with the smallest outcome-first prompt, tune reasoning.effort separately from text.verbosity, add validation loops for high-stakes tasks, and budget retrieval instead of dumping full documents.