Pick A when inputs already live in Excel and cell-by-cell review in place is wanted, B for a fast full-table draft on small teams, C when you want every missing piece of evidence flagged instead of filled in.
Option A: Copilot in Excel: matrix built beside the source
Best when: Your data already sits in Excel.
What it does: Copilot in Excel proposes cells in place; you check each one.
Strong at: Works inside Word, Excel, Outlook and Teams.
Limit: Needs a paid Microsoft 365 plan with Copilot.
Free plan: Paid plan needed
Option B: ChatGPT: full matrix in one pass
Best when: You want a quick full table.
What it does: ChatGPT drafts the table; you check each cell.
Strong at: Writes, rewrites and summarises text.
Limit: Free plan limits file uploads, so paste text instead.
Free plan: Yes, limited (images, voice, file uploads)
Option C: Claude: conservative pass that flags gaps
Best when: You want to see what is not known.
What it does: Claude flags missing evidence; you review the flags.
Strong at: Drafts and edits text; summarises documents.
Limit: Usage is capped in 5-hour and weekly windows.
Free plan: Yes, limited (usage capped in 5-hour and weekly windows)