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Claude

Claude is Anthropic's flagship AI assistant. Since March 2025, Claude has web search capability, but training data presence remains crucial for accurate brand representation.

In this guide

  • How Claude's web search capability works
  • What sources feed Claude's training data
  • How to influence Claude's knowledge about your brand
  • The importance of authoritative source presence
8 min read Prerequisite: Model Comparison
Mar 2025

Training Cutoff

200K

Context Window

Yes

Web Search

Anthropic

Provider

Claude's Dual Knowledge System

As of March 2025, Claude now has web search capability. However, Claude's training data still forms its core knowledge base. When users ask about your brand, Claude may use training data, web search, or both, depending on the query.

What This Means for You

  • Web search enables Claude to find current information about your brand
  • Training data presence still matters for establishing brand authority
  • Claude automatically decides when to search vs. use training data

Key Takeaway

Claude now has a hybrid approach like ChatGPT.

Build authority through high-quality sources for training data inclusion, while maintaining strong SEO for when Claude uses web search. This dual strategy maximises your visibility across all query types.

Claude Model Variants

Recommended

Claude Sonnet 4

Best balance of capability and speed. Training cutoff: March 2025. Supports web search.

Claude Opus 4

Most capable model for complex reasoning. Training cutoff: March 2025. Best for analytical tasks.

Claude 3.5 Sonnet

Previous generation, still widely used. Training cutoff: April 2024. Web search available.

Claude 3.5 Haiku

Fastest and most affordable. Training cutoff: July 2024. Good for high-volume use cases.

What Sources Feed Claude's Training

Anthropic hasn't disclosed exact training sources, but based on known AI training practices and Claude's behavior, likely sources include:

High Priority Sources

  • • Wikipedia
  • • Major news publications
  • • Academic papers
  • • Official documentation
  • • Government/educational sites

Secondary Sources

  • • Industry publications
  • • High-quality blogs
  • • Product documentation
  • • Press releases (major outlets)
  • • Professional directories

Optimisation Strategies for Claude

1. Build Wikipedia Presence

If your brand is notable enough, a Wikipedia article significantly increases Claude's knowledge of you. Focus on building genuine notability through press coverage, awards, and industry recognition.

2. Get Featured in Major Publications

Guest posts, interviews, and features in publications like TechCrunch, Forbes, or industry-leading sites feed training data. Quality matters more than quantity.

3. Maintain Consistent Entity Information

Ensure your brand information is consistent across all sources: company name, description, products, leadership. Inconsistencies confuse training and lead to inaccurate responses.

4. Create Comprehensive Documentation

Detailed, publicly accessible product documentation and company information pages help establish facts about your brand that can be learned during training.

Technical Implementation

While Claude doesn't browse live, Anthropic may crawl public web content for training. Ensure AI crawlers aren't blocked from your authoritative content.

Allow AI Crawlers

Testing Claude's Knowledge

Regularly test what Claude knows about your brand:

Sources