The best AI tool for correspondence & drafting
for executive assistants
We tested the best AI tools for correspondence & drafting for executive assistants in 2026. Here's what won, and what the runners-up are good for.
Claude
After testing against real executive assistants workflows in Q1 2026, Claude is the clear winner for correspondence & drafting. It excels where other tools fall short: drafting letters, memos & replies. The gap between Claude and the runners-up is meaningful in day-to-day use.
What separates Claude from the competition is how it handles the edge cases that come up in real executive assistants work, not just the showcase demos. For executive assistants specifically, that distinction matters more than raw benchmark scores.
What it gets right
- Best-in-class writing quality and tone
- Matches an executive's voice with examples
- Handles sensitive, high-stakes drafting well
Where it falls short
- No email-client integration
- Needs voice examples to personalize
- Review before sending anything sensitive
The runners-up
ChatGPT
ChatGPT drafts letters, emails, and replies in any tone and iterates conversationally, making it a strong all-round substitute for Claude on correspondence. It is slightly more prone to a generic voice without careful prompting, but its ubiquity, memory, and ecosystem make it a dependable default for everyday writing across an executive’s inbox.
Grammarly
Grammarly works alongside whatever you write in, catching tone, clarity, and correctness issues before a message goes out, and now drafts and rewrites with AI too. It is less a from-scratch generator than a safety net that keeps executive correspondence consistent and error-free. A natural complement when the priority is polish on high-stakes messages.
Microsoft Copilot
Copilot drafts and summarizes email directly inside Outlook, using context from your calendar and documents, which suits executives and assistants who live in Microsoft 365. Keeping correspondence in the same suite as the rest of the workflow avoids tool-switching. Less flexible than a standalone chatbot for free-form writing, but tightly integrated where it counts.
Common questions about AI for correspondence & drafting
Can it write in the executive's voice?
With a few samples of their style, yes, it adapts diction and formality closely. Review high-stakes pieces before sending.
Claude or ChatGPT for correspondence?
Claude edges ahead on tone and nuance for sensitive writing; ChatGPT is a fine all-rounder.
Will it handle confidential drafts safely?
Use approved, privacy-protective tools for sensitive content and confirm retention terms before pasting anything confidential.
Can it polish what I've already written?
Grammarly is built for exactly that, refining clarity and tone on existing drafts.
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