The best AI for writing emails and summarizing long documents

Why Claude

Claude's free plan is built to handle long reading. Anthropic's pricing page lists a context window (how much text the AI can "hold in mind" at once) of up to 1 million tokens, varying by model, on every plan, including Free. That matters when you paste in a long report, contract, or meeting transcript. The free plan also lets you search the web, create files, and keep memory across conversations.

Who it's for

Anyone who wants a clear email draft, a tidy summary of a long PDF, or a second pair of eyes on their writing, and doesn't want to pay just to try it.

What Claude costs

Source: official Claude pricing, checked October 14, 2026.

Is the free plan enough?

For a few emails and summaries a day, probably yes. Free usage limits reset on a rolling 5-hour window, and Anthropic doesn't publish a fixed message count; long documents and long chats use up your allowance faster. If you hit the limit a lot, Pro is the next step.

Try it in 5 minutes

1. Go to claude.ai and sign up for free with your email or Google account.
2. Paste in (or attach) a long document and type: "Summarize this in 5 bullet points for someone who has 2 minutes. Then list any deadlines or action items."
3. Then ask: "Now write a short, friendly email to my team sharing those points." Edit, copy, and send it yourself.

Try Claude

Runner-up: ChatGPT

The free plan offers unlimited text chats with GPT-6 (within OpenAI's fair-use rules), which makes it great for quick emails. But for long documents, the free plan's input limit is listed at about 12 pages of text for its quick model, compared with about 40 pages on paid plans. Paid plans are Go at $8/month (US price) and Plus at $20/month.

Source: ChatGPT pricing, checked October 14, 2026.

Common questions

What is the best free AI for writing emails?

Our pick is Claude. Its free plan writes clear email drafts and can read long documents, with usage limits that reset on a rolling 5-hour window. Runner-up: ChatGPT, whose free plan offers unlimited text chats within fair-use rules. Based on published info, checked October 14, 2026.

What is the best AI for summarizing a long PDF or document?

Claude. Anthropic lists a context window of up to 1 million tokens (varying by model) on every plan, including Free, so it can take in long reports, contracts, and transcripts. ChatGPT's free plan is listed at about 12 pages of input for its quick model.

How much does Claude cost?

Claude has a free plan. Pro is $20/month (or $17/month billed yearly), and Max starts at $100/month.