1. Clarify the product scope and whether the request is general docs lookup, model selection, a GPT-5.4 upgrade, or a GPT-5.4 prompt upgrade.
2. If it is a model-selection request, load `references/latest-model.md`.
3. If it is an explicit GPT-5.4 upgrade request, load `references/upgrading-to-gpt-5p4.md`.
4. If the upgrade may require prompt changes, or the workflow is research-heavy, tool-heavy, coding-oriented, multi-agent, or long-running, also load `references/gpt-5p4-prompting-guide.md`.
5. Search docs with a precise query.
6. Fetch the best page and the exact section needed (use `anchor` when possible).
7. For GPT-5.4 upgrade reviews, always make the per-usage-site output explicit: target model, starting reasoning recommendation, `phase` assessment when relevant, prompt blocks, and compatibility status.
8. Answer with concise guidance and cite the doc source, using the reference files only as helper context.
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