OpenAI

    Last verification date: 2026-07-28

    OpenAI guidance emphasizes clear instructions, explicit output formats, structured outputs, tools, and evals. Stable guidance: define the task, source boundary, output contract, and evaluation path. Model-specific guidance: model selection, reasoning behavior, and API feature details should be checked against official docs.

    ## Official sources used

    - [OpenAI prompt engineering guide](https://platform.openai.com/docs/guides/prompt-engineering)

• OpenAI API prompt best practices
• OpenAI structured outputs
• OpenAI function calling

  ## Stale quickly
  
  - model defaults.
  

  • Responses API feature changes.
  • tool and eval product behavior.