Claude

87% accuracyHallucination risk: Low

by Anthropic · Last updated June 2026

Careful, nuanced reasoning with a safety focus.

Overview

Claude, from Anthropic, is known for careful, nuanced answers and a willingness to express uncertainty. It handles long documents well and tends to be more measured than other assistants, making it a favorite for analysis, writing, and reasoning-heavy work. It is generally cautious — but caution is not a guarantee of correctness.

Strengths

  • Strong, structured reasoning on complex questions
  • More likely to acknowledge uncertainty and caveats
  • Excellent with long documents and large context
  • High-quality, thoughtful writing

Weaknesses

  • Can still hallucinate specifics, especially citations
  • Sometimes over-hedges or refuses borderline requests
  • Knowledge cutoff limits recency without tools
  • Less real-time web access than search-native tools

How accurate is it?

Claude tends to perform strongly on reasoning and comprehension benchmarks and is often praised for not overstating confidence. On factual recall it is comparable to other frontier models, with the same caveat: recent events and precise figures remain weak spots without external tools.

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Hallucination profile

Claude hallucinates less often than many peers and is more likely to say 'I'm not sure,' but it is not immune. Invented references and overly specific details still appear, particularly for obscure topics. Its measured tone can make wrong answers feel more trustworthy than they are.

Best use cases

  • Analyzing long reports and contracts
  • Nuanced writing and editing
  • Step-by-step reasoning problems
  • Summaries that preserve caveats

Verification tips

  • Lean on its uncertainty cues, but still verify specifics
  • Confirm citations by opening the actual source
  • Use it alongside a search-native model for recency
  • Re-ask the same question to test answer stability

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