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PDFs, transcripts, articles, books — which AI compresses 30,000 words without dropping the point.
One prompt, four answers side by side: ChatGPT, Claude, Gemini and Grok in Compare Mode
Summarisation looks easy until you stress-test it on a 200-page document. Then context window, attention, and faithfulness to the source all matter — and the gap between the four models widens fast.
If you summarise often, run the same input through two models in MultipleChat. The differences are sometimes dramatic.
Claude's context window holds almost any single report or transcript, and in our testing it is the most faithful across the whole document: it is the least likely to drop what sits in the middle. For one-shot summaries that need to be defensible, it wins.
Try this prompt
Strength
Best long-context attention; least likely to invent.
Weakness
For book-length or many-file inputs, Gemini is often the better fit.
When to use
Reports, transcripts, long PDFs.
Strength
Very long context, so book-length inputs usually fit. Strong on multi-doc summaries.
Weakness
Slightly less polished prose in the output.
When to use
Massive documents, multi-source summarisation.
Strength
Reliable, fast, integrated file upload.
Weakness
Less thorough than Claude on very long inputs unless you ask for structure.
When to use
Articles, short PDFs, regular workflows.
Strength
Punchy summaries with an opinion.
Weakness
Sometimes too compressed for a detailed brief.
When to use
Quick takes on shorter pieces.
Ranking reviewed October 2026 against each provider's current flagship models: OpenAI GPT-6.1 Sol and GPT-6 Astra, Anthropic Claude Opus 5.5 and Sonnet 5.5, Google Gemini 4 Argon and xAI Grok 4.7. Scores are our editorial judgement of typical results for summarising documents, not a published benchmark.
Does the summary stick to what the source said?
How much can you paste in one go?
Does it weight the start/end fairly, not just the start?
Will it actually follow a structured format you ask for?
Claude for most documents; Gemini for very long ones. In MultipleChat you can upload the PDF once and send the same summary prompt to both.
Claude — least likely to miss a quiet but important moment in the transcript.
Sometimes. Ask for 'anything material' and 'what's missing', not just a summary, to compensate.
Use it as a draft. Verify against the source. Never cite an AI summary as the document itself.
Compare Mode sends one prompt to ChatGPT, Claude, Gemini and Grok and shows the answers in parallel columns, so you can check this ranking on your own documents. The $20/month Pro plan includes all four, plus Perplexity.
See plansAlso see: Best AI for long documents · Which AI should I use? (quiz) · Best AI for other tasks · AI for your profession
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Use several frontier models together for stronger answers and fewer blind spots.
ComparisonCompare several AI answers side by side when the output matters.
PricingSee the AI subscription that replaces separate ChatGPT, Claude, Gemini, Grok and Perplexity accounts.
Multi-model AIRun the same prompt through available ChatGPT, Claude, Gemini and Grok models and compare their answers.
GuideChoose the best model for writing, research, coding, documents, images and business work.
AlternativeUse ChatGPT alternatives together: Claude, Gemini, Grok, Perplexity, files, web search and creation tools.
