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feat: use 'developer' role for GPT-5 and Codex models (#4498)

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OpenAI's newer models (GPT-5, Codex) give stronger instruction-following
weight to the 'developer' role vs 'system'. Swap the role at the API
boundary in _build_api_kwargs() for the chat_completions path so internal
message representation stays consistent ('system' everywhere).

Applies regardless of provider — OpenRouter, Nous portal, direct, etc.
The codex_responses path (direct OpenAI) uses 'instructions' instead of
message roles, so it's unaffected.

DEVELOPER_ROLE_MODELS constant in prompt_builder.py defines the matching
model name substrings: ('gpt-5', 'codex').
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Teknium 2026-04-01 14:49:32 -07:00 • committed by GitHub
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agent/prompt_builder.py
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@ -189,6 +189,13 @@ TOOL_USE_ENFORCEMENT_GUIDANCE = (
# Add new patterns here when a model family needs explicit steering.
TOOL_USE_ENFORCEMENT_MODELS = ("gpt", "codex")
# Model name substrings that should use the 'developer' role instead of
# 'system' for the system prompt. OpenAI's newer models (GPT-5, Codex)
# give stronger instruction-following weight to the 'developer' role.
# The swap happens at the API boundary in _build_api_kwargs() so internal
# message representation stays consistent ("system" everywhere).
DEVELOPER_ROLE_MODELS = ("gpt-5", "codex")
PLATFORM_HINTS = {
"whatsapp": (
"You are on a text messaging communication platform, WhatsApp. "