Claude sometimes gives incorrect answers.
Resolved true The record shows it happened or was so.
Factual: Statements about the present or the past, checked against the record: did they hold up?
The evidence is the person's or their organisation's own records.
Said for an organisation they lead or work for; it counts on both records.
What would count as true or false
True if documented cases, benchmark error rates or Anthropic's own documentation from on or before May 2026 show that Claude sometimes gives incorrect answers. Mostly true if this holds with only a small nuance. Mostly false or false only if credible evidence showed that Claude essentially never errs, which would contradict the claim.
Set before the research began.
Evidence (3)
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E1 Claude is providing incorrect or misleading responses. What’s going on? | Claude Help Center Anthropic (Claude Help Center) · 16 March 2026 Own record
“In an attempt to be a helpful assistant, Claude can occasionally produce responses that are incorrect or misleading.”
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E2 Model Card and Evaluations for Claude Models Anthropic · 19 July 2025 Own record
“Claude models still confabulate – getting facts wrong, hallucinating details, and filling in gaps in knowledge with fabrication.”
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E3 Model Card and Evaluations for Claude Models Anthropic · 19 July 2025 Own record
“Claude 2.1 demonstrated a 30% reduction in incorrect answers and a 3-4x lower rate of mistakenly concluding a document supports a particular claim.”
Reasoning
The resolution criteria accept Anthropic's own documentation from on or before May 2026. Anthropic's Help Center article of March 2026 says Claude can occasionally produce incorrect responses [E1]. Anthropic's model card (E2, E3, July 2025) says Claude models "still confabulate – getting facts wrong." It also reports a 30% reduction in incorrect answers for Claude 2.1, which means the earlier model gave incorrect answers at some rate. None of the evidence suggests that Claude essentially never errs.
Cite this claim
Daniela Amodei, “Claude sometimes gives incorrect answers.” (said 9 May 2026). Verdict: resolved true. Reliability API, claim c_4fadfa25f0fd, method 0.1.0+28da144b, dataset release v1.1.2. https://epistacklabs.com/claims/c_4fadfa25f0fd
This claim is in dataset release v1.1.2, with the same verdict.
Reply to this claim
More factual claims by Daniela Amodei
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Mostly true
“In the lab, Claude designed new protein binders from scratch.”
In laboratory work, Anthropic's Claude designed new protein binders from scratch.
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Mostly true
“including open-source code much of the internet runs on, before attackers could exploit them.”
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Resolved true
“They also showed that more than 6,000 women had come in for prenatal care, but only 1,762 had delivered with a healthcare worker present, a discrepancy that the team is investigating and addressing.”
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Resolved true
“Those dashboards flagged a spike of 25,000 pneumonia cases, so the team can anticipate and plan for future surges.”
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Resolved true
“Sometimes Claude is wrong.”
Verdicts are made automatically; how verdicts are made.