GPT-5.6 Prompting Best Practices: The Complete Migration Walkthrough
Rewrite your GPT-5.6 system prompt and agent configuration using all five official prompting practices, with before-and-after examples and migration checks.
This developer walkthrough turns all five official GPT-5.6 prompting practices into concrete system-prompt and Responses API changes: leaner prompts, explicit autonomy and approval boundaries, controlled response length and style, selective pro mode, and task-shaped Programmatic Tool Calling.
Every chapter separates the documented guidance from the engineering translation and the migration note, then closes with a check you can run against your own agent configuration.
Official sources
- GPT-5.6 model guidance and prompting best practices
- Programmatic Tool Calling
- Reasoning mode and pro mode
The examples in this video are implementation-oriented rewrites of the official guidance. They are not quotations unless explicitly labeled as official policy text.
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