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Books, contracts, transcripts, codebases — which AI handles the giant context without losing the middle.
One prompt, four answers side by side: ChatGPT, Claude, Gemini and Grok in Compare Mode
Long-document work tests context window, attention quality, and the 'lost-in-the-middle' problem — where a model technically accepts a huge input but pays less attention to the middle of it. The four models differ a lot here.
If you're routinely working with PDFs over 50 pages or transcripts over 10,000 words, the model you choose actually matters.
Google has pushed context length further than the other labs, and Gemini's very large window means a full book, a stack of contracts or a codebase usually fits in one go, with strong attention across it. Claude wins on faithfulness when the document fits comfortably in its own large window, which most professional documents do.
Try this prompt
Strength
Largest practical window of the four; strong attention across long documents; also reads video.
Weakness
Slower on very long inputs.
When to use
Books, codebases, multi-document analysis, video.
Strength
Best output quality per token; least likely to invent.
Weakness
For book-length or many-file inputs, Gemini has more room.
When to use
Most professional long-doc work — reports, contracts, transcripts.
Strength
Reliable on everyday long docs; can search uploaded files for the relevant parts.
Weakness
Less faithful than Claude on very long inputs in our testing.
When to use
Most everyday docs; not for whole books.
Strength
Strong on documents that fit; punchy summaries.
Weakness
Less long-document-specialised than Gemini or Claude.
When to use
Shorter long-form.
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 long documents, not a published benchmark.
How much can you paste in one go?
Does it actually use the middle of long inputs?
Does the output stay true to the source?
Can it compare across documents?
Claude or Gemini: a 300-page PDF fits in either. Claude tends to give the more faithful summary; Gemini handles larger stacks of files. Run both side by side in MultipleChat for the cross-check.
Usually, yes. Gemini has the most room for book-length input. Answers stay best when you ask one focused question per chat.
Ask structured questions, not 'summarise this'. A structured prompt like the one above usually beats a bare summary request.
Ask for page or line references. The honest models will admit when they don't have one.
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 summarising · 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.
