Short answerA good proposal states the situation, scope and exclusions, the approach, deliverables, the test plan, assumptions, a timeline against the retirement date and costs, including who pays platform and model fees.
- Situation: OpenAI plans to retire Custom GPTs (planned December 11, 2026; dates can change: dates); the client relies on the GPT for [purpose].
- Scope: which GPTs; what is included (instructions, files, Actions); what is excluded (for example live integrations not in scope).
- Approach: audit, backup, rebuild on the agreed destination, test, handover (process).
- Deliverables: final instructions, knowledge files, test results, documentation and a handover package.
- Test plan: test set and pass criteria (testing).
- Assumptions and risks: client provides originals and access; behavior will differ slightly (risks).
- Timeline: phases back from the retirement date (plan).
- Costs: fees plus pass-through platform and model costs (pricing models).
- Next steps: approval, access, kickoff.
Do not promise identical behavior or income results. Scope questions: intake.
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