ISMS Copilot
Tools

Analyze large compliance documents with Claude 4.6

ISMS Copilot's Claude Sonnet 4.5 and Opus 4.6 models offer a 1 million token context window—enough to analyze up to 1,500 pages of compliance documents in a single conversation. This guide explains how to use these advanced models for large-scale document analysis.

Which models support large document analysis

Claude model access depends on your subscription plan and the mode you select:

  • Fast mode: Uses Claude Sonnet 4 or 4.5 (available on all plans)

  • Think mode: Uses Claude Opus 4.5 or 4.6 with 1M token context (Plus, Pro, and Business plans only)

Free plan conversations are limited to 300,000 tokens total. For large document analysis, upgrade to Plus ($24/month) or higher to access Think mode and the full 1 million token context.

Think mode also includes automatic conversation compaction. When you approach the token limit, Opus 4.6 summarizes earlier parts of the conversation so you can continue indefinitely without losing context.

How to select Think mode

Toggle between Fast and Think mode using the selector next to the send button in any conversation. Think mode processes queries more thoroughly and maintains significantly more context, making it ideal for complex compliance analysis across multiple documents.

If Think mode is unavailable, you'll see an upgrade prompt—your current plan doesn't include access to Opus 4.5/4.6.

Document upload limits

You can upload multiple files in a single conversation. Supported formats and limits:

  • PDF, DOC, DOCX, XLS, XLSX: Up to 5MB per file

  • TXT, CSV, JSON: Up to 10MB per file

  • Maximum: 10 files per batch upload

Free plan users can upload 10 files per month (resets at 00:00 UTC on the 1st). Paid plans have unlimited file uploads.

If a PDF exceeds 5MB, split it into smaller files before uploading. Most compliance documents under 200 pages stay within the limit.

Estimating how many files fit in 1M tokens

The 1 million token context window translates to approximately 700,000-800,000 words or 1,500 pages of text. In practice:

  • A typical ISO 27001 policy document (15-20 pages) uses roughly 10,000-15,000 tokens

  • A detailed audit report (50 pages) uses approximately 35,000-40,000 tokens

  • You can analyze 10-20 compliance documents simultaneously, depending on length and formatting

Your conversation history also counts against the token limit. For the largest analyses, start a fresh conversation in Think mode and upload all relevant documents at once.

Best practices for large document analysis

Use workspaces to organize multi-client or multi-project work. Each workspace maintains separate conversation histories, preventing context mixing across clients.

Upload documents in a fresh conversation when possible. This maximizes available tokens for the documents themselves rather than prior conversation history.

Be specific in your prompts. Instead of "analyze these documents," ask "perform an ISO 27001 Annex A gap analysis against these policies and identify missing controls in A.8 (Asset Management)." Specific prompts help Claude focus on what matters.

Export results to Markdown or DOCX for audit-ready documentation. Think mode's structured outputs work well for gap analysis reports, control mappings, and evidence summaries.

Always verify AI-generated compliance analysis against the official standard. ISMS Copilot accelerates your workflow but doesn't replace professional judgment.

Common use cases

  • Gap analysis: Upload your current policies and ask Claude to map them against ISO 27001, SOC 2, or NIST CSF requirements

  • Audit preparation: Upload evidence documents and ask for a summary of coverage by control area

  • Policy review: Upload multiple policy versions and ask Claude to identify inconsistencies or outdated language

  • Risk assessment: Upload risk registers and supporting documentation for comprehensive analysis across multiple risk domains

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