references/upgrade-guide.md
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Source excerpt starting at line 1.# Model upgrade guidance Use this file only as a bundled routing fallback when the live migration guide cannot be fetched. For latest, current, default, or unspecified-model upgrades: 1. Run `scripts/resolve-latest-model-info`.2. Fetch the returned `migrationGuideUrl` and `promptingGuideUrl` exactly.3. Treat the live guides as canonical.4. If remote retrieval fails, disclose that bundled fallback guidance is being used. For an explicit GPT-6 Astra migration: 1. Preserve the user's explicit target; do not run the latest-model resolver.2. Fetch the live GPT-6 model guidance: https://developers.openai.com/api/docs/guides/latest-model/gpt-6-astra.md 3. Read `references/upgrading-to-gpt-6-astra.md` for skill-specific migration judgment.4. Read `references/prompting-guide.md` only when prompt changes are needed. For another explicit model target, preserve that target and fetch its current official guidance. Do not reuse GPT-6-specific defaults, API shapes, or compatibility rules for a different model.