Web Search
Claude can look up current news, live prices, and recent events that may have changed since its training data was cut off. This lesson covers when search runs, how it differs from built-in knowledge, and how citations appear.
Why web search matters
Claude's built-in knowledge comes from training on text up to a fixed date — called the knowledge cutoff. It knows history, concepts, and general facts well, but it cannot know what happened yesterday unless you provide that information or it searches the web.
How and when Claude searches
Claude does not search the web on every message. It decides when live information would improve the answer. You can also nudge it by asking explicitly.
| Trigger | When it applies | Example |
|---|---|---|
| Current events and news | Recent elections, sports results, product launches, or breaking news. | "What happened at the tech conference this week?" |
| Live data | Stock prices, exchange rates, weather, sports scores, or anything that changes frequently. | "What is the USD to EUR exchange rate right now?" |
| Time-sensitive facts | Words like "today", "latest", "current", "now", or "2026" signal that training data may be outdated. | "Who is the current CEO of OpenAI?" |
| Explicit request | You ask Claude directly to search the web or look up a specific source. | "Search the web for reviews of the latest iPhone." |
Knowledge cutoff vs live search
The difference determines whether Claude answers from training data or runs a web search.
| Topic | Knowledge cutoff | Live web search |
|---|---|---|
| Data source | Training data (fixed date) | Current web pages |
| Best for | Concepts, history, how-to, stable facts | News, prices, recent events, live stats |
| Freshness | Stops at knowledge cutoff date | Reflects what is online now |
| Sources | Usually no citations | Often includes clickable source links |
| Reliability note | May say "I don't know" for post-cutoff events | Depends on quality of pages found |
“Who won the most recent FIFA World Cup?”
Argentina won the 2022 FIFA World Cup. I don't have information about tournaments after my knowledge cutoff, so I cannot confirm more recent results.
“Who won the most recent FIFA World Cup?”
Argentina won the 2022 FIFA World Cup, defeating France in the final. This is the most recent tournament as of the latest available reports.
Citing sources
When Claude uses web search, it often cites the pages it relied on. Citations help you verify facts, read the original article, and judge how trustworthy the answer is.
- Inline references — small numbered markers appear next to claims drawn from a specific source.
- Source list — a Sources section at the bottom lists each reference with the page title and domain.
- Clickable links — you can open the original page in your browser.
- Not every answer — citations appear when web search was used. Answers from training data alone typically have no source list.
NASA's latest Mars missions focus on sample return and surface exploration. The agency has outlined updated timelines for upcoming rover deployments1 and international partnership plans2.
Public reporting also highlights budget and scheduling updates for the programme3.
Sources
NASA Mars Mission Update
nasa.gov
Space Agency Timeline 2026
space.com
Mars Exploration Overview
bbc.com
Tips for better search results
| Tip | What to do |
|---|---|
| Be specific | Name the topic, date range, or region — "UK inflation rate March 2026" beats "inflation". |
| Ask for sources | Add "cite your sources" or "include links" if you want references in the response. |
| Verify critical facts | Click through to the original source before using data in reports or decisions. |
| Combine with files | Upload a document and ask Claude to compare it with current web information. |
Before you continue
- Claude searches the web when a question needs current or live information.
- Knowledge-cutoff answers come from training data; web search answers come from live pages.
- Search results often include numbered citations and source links you can verify.
- For recent events or live data, ask explicitly or include words like “today” or “latest”.
What's Next
Artifacts — code, documents, HTML, and React components in a side panel you can edit and export.