Option A: Claude: drafts the letter, you check it
Best when: You want a draft to correct line by line against your brief
What it does: Claude drafts and corrects; you gather facts and check
Strong at: Placeholders and a gap list for missing facts
Limit: You gather and check every input yourself first
Free plan: Yes, limited (session limit resets every five hours)
Option B: ChatGPT: drafts the letter with placeholders, you check
Best when: You want the full draft written from your checked note
What it does: ChatGPT drafts the letter; you check and fill placeholders
Strong at: Bars added facts; keeps real details as placeholders
Limit: A draft can add or miss something; you check it all
Free plan: Yes, limited (uploads, images, voice, data analysis)
Option C: ChatGPT: drafts, Grammarly polishes, you check
Best when: You want drafting and polish done for you, then one check
What it does: ChatGPT drafts, Grammarly polishes; you check every change
Strong at: The wording tool only ever sees your checked text
Limit: Grammarly returns edited text, not a separate ambiguity list
Free plan: ChatGPT: Limited (uploads, images, voice, analysis); Grammarly: Limited (100 AI prompts monthly)