Option A: ChatGPT: drafts, then applies your checked edits
Best when: You want a quick first draft from checked notes.
What it does: ChatGPT drafts; you check every line against records.
Strong at: Writes, rewrites and summarises text.
Limit: You must check every line against your records.
Free plan: Yes, limited (images, voice, deep research, Codex)
Option B: ChatGPT: asks about gaps only, you write the result
Best when: You want full control and help spotting gaps only.
What it does: You write everything; ChatGPT only asks gap questions.
Strong at: Writes, rewrites and summarises text.
Limit: You do all the drafting work yourself.
Free plan: Yes, limited (images, voice, deep research, Codex)
Option C: Claude drafts, Grammarly tidies the wording
Best when: You have approved routes and limits and want a draft, then polish.
What it does: Claude drafts; Grammarly tidies wording; you check both.
Strong at: Checks grammar, spelling, punctuation and tone.
Limit: Two outputs need checks: the facts and the wording edits.
Free plan: Claude: Yes, limited (five-hour resets); Grammarly: Yes, limited (100 AI prompts/month)