Summary  
The chapter covers handling unreliable outputs by validating and verifying data, implementing fallback mechanisms to supplement stale information, and designing interactions that mitigate confirmation bias.  

General domain of usage  
Conversational AI assistants

### Hallucinations

A **hallucination** occurs when Claude provides information that sounds confident and convincing but is actually incorrect. While AI models have become significantly more accurate over the past few years, mistakes can still happen.

For everyday tasks, this is often a minor issue. However, when accuracy is critical, such as with statistics, regulations, legal matters, medical information, or financial decisions, you should always verify important facts using reliable sources.

A useful rule of thumb: if you're going to act on a specific fact, take a moment to confirm it independently.

### Knowledge Cutoff and Web Search

AI models are trained on large datasets and then released. They do not continuously learn from new events after training, which means they have a knowledge cutoff, a point after which they may not know about recent developments.

For example, if you ask about today's news with web search disabled, Claude may not be able to provide current information. With web search enabled, Claude can search the internet, review recent sources, and use that information to answer questions about current events and other time-sensitive topics.

As a general rule, if you need up-to-date information, enable web search. This allows Claude to supplement its training with current information and provide more relevant answers.

When should you use web search with Claude?

Learn how to get the most out of Claude for work, study, and everyday tasks. This course covers everything from writing better prompts and analysing documents to using advanced features such as Projects, Artifacts, Memory, Skills, and Connectors. You'll also explore how Claude integrates with tools like Chrome, Slack, Excel, PowerPoint, and mobile devices. By the end of the course, you'll be able to use Claude confidently to save time, improve productivity, and solve real-world problems more effectively.

Learn the fundamentals of Claude, including account setup, the interface, plans, and core capabilities.

Master practical prompting techniques that help you get more accurate, useful, and consistent results.

Explore how Claude can help with writing, summarisation, research, document analysis, and working with data.

Unlock advanced features such as Projects, Memory, Custom Instructions, Artifacts, and long-conversation management.

Connect Claude to the tools you already use, including Chrome, Slack, Microsoft 365, mobile apps, Skills, and Connectors.

Understanding AI Limitations

Hallucinations

Knowledge Cutoff and Web Search