Understanding the Capabilities and Limitations of Claude
Introduction to Claude’s Search Feature
Claude, a large language model, has been making waves with its impressive capabilities, including its search feature. However, users should be cautious when relying on its citations and sources. A recent survey of citation accuracy by LLM-based web search assistants showed a 60 percent error rate. This highlights the importance of verifying information through multiple independent sources.
Caution over Citations and Sources
When using Claude’s search feature, it provides citations for information it includes from online sources, which can be helpful for verifying facts. However, it’s essential to remember that these citations may not always be accurate. In fact, a study found that LLMs like Claude can sneak in plausible-sounding confabulated sources. This means that even if the information appears accurate at first glance, it may not be entirely reliable.
A screenshot example of what Anthropic Claude’s web search citations look like is shown below.
A screenshot example of what Anthropic Claude’s web search citations look like, captured March 21, 2025.
Credit:
Benj Edwards
Importance of Verification
Even if Claude’s search feature were 99 percent accurate, the 1 percent chance of error could have significant consequences if the information is relied upon blindly. It’s crucial to vet any information delivered by Claude (or any AI assistant) using multiple independent non-AI sources before accepting it as true.
A Partnership with Brave
Behind the scenes, Anthropic has partnered with Brave Search to power its search feature. Brave Search is a “private search engine” that markets itself as a more secure alternative to traditional search engines. This partnership was discovered through Anthropic’s subprocessor list, which added Brave Search on March 19.
The connection between Anthropic and Brave was further demonstrated by Simon Willison, who found that Claude’s search results were an exact match for those on Brave Search. This has implications for individuals and organizations that may want to block Claude from accessing their sites, as Brave’s web crawler is doing the web indexing.
Conclusion
In conclusion, while Claude’s search feature can be a powerful tool, it’s essential to approach its citations and sources with caution. Verification through multiple independent sources is crucial to ensure the accuracy of the information. Additionally, the partnership with Brave Search raises important questions about data privacy and access to websites.
Frequently Asked Questions
Q: Is Claude’s search feature accurate?
A: While Claude’s search feature can provide accurate information, it’s not always reliable. A recent study found that LLMs like Claude can have a 60 percent error rate in citation accuracy.
Q: How does Claude’s search feature work?
A: Claude’s search feature is powered by Brave Search, a “private search engine” that uses its web crawler to index websites.
Q: Can I block Claude from accessing my website?
A: Yes, but the process is not clear. Anthropic has not provided information on how sites or companies can opt out of the feature. It’s recommended to reach out to Anthropic for clarification.