OpenAI has published a prompting guide for GPT-5.6 after internal coding-agent tests found that leaner system prompts improved evaluation scores by roughly 10%–15%.
According to NS3.AI, the guide introduces guidance on Programmatic Tool Calling and adds the text.verbosity API parameter.
The update follows OpenAI’s internal testing focused on coding-agent performance, where reducing system-prompt length was associated with higher eval results.
AI TRENDS | OpenAI Releases GPT-5.6 Prompting Guide After Tests Show Lean System Prompts Lift Scores 10%–15%
2026-07-13 22:50:14
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