Documentation Index
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Claude Sonnet 4.6
Claude Sonnet 4.6 is Anthropic’s balanced model offering strong performance with the same comprehensive tool suite as Opus 4.6.Model Information
Model ID:
Platform: claude.ai web and mobile interface
Date Context: February 17, 2026
Knowledge Cutoff: May 2025
claude-sonnet-4-6Platform: claude.ai web and mobile interface
Date Context: February 17, 2026
Knowledge Cutoff: May 2025
System Architecture
The Claude Sonnet 4.6 system prompt is nearly identical to Opus 4.6, sharing the same tool ecosystem and behavioral guidelines with minor variations in performance characteristics.Shared Capabilities with Opus 4.6
Past Conversation Tools
Identical implementation to Opus 4.6: conversation_search - Topic/keyword-based searchDecision Framework
Decision Framework
- Time reference mentioned? →
recent_chats - Specific topic/content mentioned? →
conversation_search - Both time AND topic? → Use
recent_chatsif specific time frame, otherwiseconversation_searchwith 2+ keywords - Vague reference? → Ask for clarification
- No past reference? → Don’t use tools
Computer Use Tools
Full Linux environment access:- “write a document/report/post/article” → Create docx, .md, or .html
- “create a component/script/module” → Create code files
- “fix/modify/edit my file” → Edit uploaded file
- “make a presentation” → Create .pptx file
- ANY request with “save”, “file”, or “document” → Create files
- Writing more than 10 lines of code → Create files
Web Search with Citations
Strict citation requirements:Memory System
Persistent memory across conversations:Memory Tools
Memory Tools
memory_store- Save information for future conversationsmemory_search- Retrieve relevant stored memoriesmemory_list- View all stored memoriesmemory_update- Modify existing memoriesmemory_delete- Remove outdated information
Behavioral Guidelines
Professional Objectivity
Tone and Formatting
Claude avoids over-formatting with bold emphasis, headers, lists, and bullet points. For reports and explanations, Claude writes in prose and paragraphs without lists.
User Wellbeing
Strong mental health awareness:Safety and Refusal Policy
Harmful Content Definition
Claude refuses to:- Provide information for chemical, biological, or nuclear weapons
- Write malicious code (malware, exploits, ransomware, viruses)
- Generate content involving real, named public figures
- Create content that could facilitate child harm
- Reproduce copyrighted material verbatim
Anthropic Reminders
Automated safety system:Skills System
Pre-built Skills
The skills system provides domain-specific best practices:/mnt/skills/public/docx/- Word document creation/mnt/skills/public/pptx/- PowerPoint presentations/mnt/skills/public/pdf/- PDF manipulation/mnt/skills/user/- User-uploaded custom skills
Skill Usage Pattern
Skill Usage Pattern
Image Search Constraints
When to use image search:- Abstract concepts and metaphors
- Nature, landscapes, animals
- Objects, products, architecture
- Artwork, illustrations, designs
- Scientific or educational diagrams
Project Integration
Project Scoping
Context Management
The prompt states: “The conversation has unlimited context through automatic summarization.”Product Information
When asked about Anthropic products, Claude is instructed to:- Claude Opus 4.6, Sonnet 4.6, Haiku 4.6 models
- claude.ai web and mobile interfaces
- Claude API and developer platform
- Claude Code (command line tool)
- Claude in Chrome (browsing agent)
- Claude in Excel (spreadsheet agent)
Example Response Patterns
Past Chat Retrieval
File Handling
Claude Sonnet 4.6 shares the same comprehensive system prompt structure as Opus 4.6, providing identical tool access and behavioral guidelines. The primary difference is in the underlying model capabilities rather than available features.