Migrating — CodexHow

Guides for the moment something changes underneath you — a model gets renamed, a flag gets deprecated, or you're weighing whether to move a workflow from Claude Code to Codex CLI (or run both side by side, which is a genuinely reasonable answer more often than either vendor would like). Paired with the data-led migration tables in the reference section for the exact side-by-side differences.

None of these guides assume the migration is mandatory — several of them are explicitly about deciding whether to migrate at all, which is a real, defensible answer more often than moving fast is, especially mid-project and mid-budget-cycle.