Framework

OpenAI Developer Message

OpenAI's official GPT-4.1 and GPT-5 production format — strict role-priority hierarchy.

Identity · Instructions · Reasoning Steps · Output Format · Examples · Context

Origin

The Developer Message format is part of OpenAI's role-priority hierarchy: System > Developer > User > Tool. The GPT-4.1 and GPT-5 prompting guides treat the developer message as the canonical place to install identity, instructions, and constraints — and the model is trained to defer to it when user input conflicts.

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The anatomy

Every OpenAI Developer Message prompt has these sections.

Identity

Who the model is. GPT-5 treats developer-message identity as higher priority than user instructions.

Instructions

Imperative rules, top-down. Conflicts resolved in favor of earlier instructions.

Reasoning Steps

Explicit chain-of-thought scaffold. GPT-5 follows numbered reasoning steps almost verbatim.

Output Format

Exact schema. JSON shape, markdown headings, max length, what to exclude.

Examples

Few-shot pairs. GPT-5 weights examples heavily for tone and structure transfer.

Context

Reference material the model can cite from but does not have to follow.

When to use

→Anything running on GPT-4o, GPT-4.1, GPT-5, or GPT-5-mini in production.
→Workflows where users can submit free-text and the system has to keep its rules.
→Agent and tool-use scaffolds where reasoning steps need to be explicit.
→Customer-facing assistants where prompt-injection resistance matters.

When not to use

×Claude-only deployments (use Anthropic XML).
×Single-shot creative work where role-priority overhead is unnecessary.

Best models

GPT-5GPT-5-miniGPT-4.1GPT-4o

Worked example

From one sentence to a OpenAI Developer Message section.

Input

"Build a triage assistant for inbound support tickets."

Sample OpenAI Developer Message section

# Identity
You are SUPPORT-TRIAGE, a senior support engineer with 8 years of experience handling tier-1 SaaS billing tickets.

# Instructions
1. Read the ticket end-to-end before classifying.
2. Never quote refund amounts…

Role · Context · Instruction · Output Format

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