Option A: ChatGPT: maps the changes and drafts the digest
Best when: You want AI to do both passes with a check between.
What it does: ChatGPT maps and drafts; you check between passes.
Strong at: Second pass starts fresh from only your checked map.
Limit: Free plan caps uploads: 3 files per day, 80 per 3 hours.
Free plan: Yes, limited (upload caps)
Option B: Gemini: maps the changes and drafts the digest
Best when: You want the map checked before any drafting happens.
What it does: Gemini maps and drafts; you check both against originals.
Strong at: You catch extraction mistakes before any drafting.
Limit: File analysis can fail; check each file was read.
Free plan: Yes
Option C: Claude: maps the changes and drafts the digest
Best when: You want Claude to map changes and draft the digest.
What it does: Claude maps and drafts; you check against both versions.
Strong at: Writing and extended thinking fit comparison mapping.
Limit: Exact change IDs and dates are not proven; compare the draft.
Free plan: Yes