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Latest results: October 29, 2026

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AI Truth Bench
  • Accuracy

    How accurate is each AI assistant?

    Tests, results and dates for every tool, with a one-word verdict.

    See all tools
    • ChatGPT logoCGIs ChatGPT accurate?Mixed
    • Gemini logoGeIs Gemini accurate?Mixed
    • Claude logoClIs Claude accurate?Mostly reliable
    • Perplexity logoPxIs Perplexity accurate?Mixed
    • Microsoft Copilot logoCoIs Microsoft Copilot accurate?Mixed
    • Grok logoGkIs Grok accurate?Unreliable
    • DeepSeek logoDSIs DeepSeek accurate?Unreliable
    • Meta AI logoMAIs Meta AI accurate?Mixed
    • Google AI Overviews logoAOAre Google AI Overviews accurate?Mixed
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    FeaturedThe most accurate AI assistantsNine assistants ranked by published accuracy and hallucination results.Read the ranking
  • Rankings

    Which AI should you rely on?

    Tools ranked side by side on the same tests, with the date of each result.

    See all rankings
    • The most accurate AI assistantsAssistants ranked on factual tests
    • The best AI fact checkersRanked on what they check and what they cost
    • All rankingsEvery ranking, with its method and date
    Six measuring cylinders filled with dark blue liquid to different levels, one marked with a yellow band.
    FeaturedThe most accurate AI assistantsNine assistants ranked by published accuracy and hallucination results.Read the ranking
  • Hallucinations

    When AI makes things up

    What hallucinations are, why they happen and how often each model makes them.

    See the full guide
    • AI hallucinations, explainedWhat they are and how to spot one
    • Real AI hallucination examplesCases from courts, newsrooms and search
    • Why does AI hallucinate?The causes, in plain terms
    • Does ChatGPT make up sources?Invented citations and how to catch them
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    FeaturedAI hallucination rates by modelHow often each model states something false, with the source and test date in every row.See the rates
  • Detectors

    What does a detector score mean?

    How each AI detector performs, and what its score can and cannot tell you.

    See all detectors
    • ZeroGPT logoZGIs ZeroGPT accurate?Unreliable
    • GPTZero logoGZIs GPTZero accurate?Mostly reliable
    • Turnitin logoTuIs Turnitin's AI detector accurate?Mixed
    • Grammarly logoGrIs Grammarly's AI detector accurate?Mostly reliable
    A round analog meter with its needle in the middle of the scale, standing behind a sheet of wavy lines marked with a yellow highlight.
    FeaturedAre AI detectors accurate?What a detector score really tells you, tool by tool.Read the overview
  • Fact-check
  • How we score
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AI Truth Bench
Accuracy
  • ChatGPT logoCGIs ChatGPT accurate?
  • Gemini logoGeIs Gemini accurate?
  • Claude logoClIs Claude accurate?
  • Perplexity logoPxIs Perplexity accurate?
  • Microsoft Copilot logoCoIs Microsoft Copilot accurate?
  • Grok logoGkIs Grok accurate?
  • DeepSeek logoDSIs DeepSeek accurate?
  • Meta AI logoMAIs Meta AI accurate?
  • Google AI Overviews logoAOAre Google AI Overviews accurate?
  • See all tools
Rankings
  • The most accurate AI assistants
  • The best AI fact checkers
  • See all rankings
Hallucinations
  • AI hallucinations, explained
  • Real AI hallucination examples
  • Why does AI hallucinate?
  • AI hallucination rates by model
  • Does ChatGPT make up sources?
Detectors
  • ZeroGPT logoZGIs ZeroGPT accurate?
  • GPTZero logoGZIs GPTZero accurate?
  • Turnitin logoTuIs Turnitin's AI detector accurate?
  • Grammarly logoGrIs Grammarly's AI detector accurate?
  • Are AI detectors accurate?
Fact-check How we score

Latest results: October 29, 2026

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    1. Home
    2. Editorial standards

    Editorial standards

    AI Truth Bench exists to tell readers whether an AI tool's answers can be trusted. That only works if our own figures can be trusted. These are the rules every page follows.

    Last updated October 30, 2026

    2 min read

    Contents

    1. Sourcing
    2. Dating
    3. Vendor claims and independent results
    4. Verdicts
    5. How we write
    6. Corrections
    A squared stack of documents with sticky flags on one edge, a brass paperweight on top and a steel ruler alongside.

    Sourcing

    Every number on the site comes from a published source that a reader can open. We use five kinds of source:

    • Studies: peer-reviewed papers, preprints and working papers, such as the academic tests of AI detectors.
    • Public benchmarks and leaderboards: shared tests where many tools are scored the same way.
    • News investigations: tests run by newsrooms and research centres on AI answers.
    • Court records: orders and filings, used for real cases of AI errors.
    • Vendor figures: what a company says about its own product.

    We collect published results; we do not run our own tests. Each figure is kept in a single results register with the tool, what was measured, the value, the date and the source link, so a number reads the same on every page that uses it. We link to the original source wherever it is publicly available, not to a summary of it.

    Dating

    Every result carries a date: the publication date of the study, the release date of a benchmark entry, or the date we checked a live page or leaderboard. Live leaderboards and vendor pages change, so pages show the date each figure was checked. Older studies stay on a page when they are still the best evidence, and the text says which version of a tool they tested.

    Vendor claims and independent results

    A vendor's own figure is always labelled as a vendor claim, in tables and in the text. Where a public benchmark accepts results that vendors submit themselves, we say so. We never rank tools by mixing figures from different tests, because each test measures something different: a detection rate in one study cannot be set against a false positive rate in another.

    Verdicts

    Each tool page gives one of four verdicts: Reliable, Mostly reliable, Mixed or Unreliable. The verdict follows from the evidence cited on that page, and the sentence beside it names the figures it rests on. The method is set out on how we score AI accuracy.

    How we write

    Pages lead with the answer, then show the evidence. We use plain words, short sentences and numbers with dates, and we avoid hype in either direction. When a test measured the model behind a product rather than the consumer app people use, the text says so. Where studies disagree, the page shows both results and explains what each one measured.

    Corrections

    If a figure is wrong, out of date or misattributed, email editors@aitruthbench.com with the page address and a link to the source. We check the report against the source. When a correction is needed, we fix the page, change its updated date and add a short dated note at the foot of the page saying what changed.

    Related pages

    See about AI Truth Bench for what the site covers and who writes it, the contact page to send a correction or a new result, the privacy policy for what data the site handles, and the terms of use for reading and sharing pages.

    AI Truth Bench

    AI Truth Bench shows how accurate AI assistants and AI detectors are, with the date and source behind every result.

    Accuracy

    • Is ChatGPT accurate?
    • Is Gemini accurate?
    • Is Claude accurate?
    • Is Perplexity accurate?
    • Is Microsoft Copilot accurate?
    • Is Grok accurate?
    • Is DeepSeek accurate?
    • Is Meta AI accurate?
    • Are Google AI Overviews accurate?
    • All tools

    Rankings

    • The most accurate AI assistants
    • The best AI fact checkers
    • All rankings

    Hallucinations

    • AI hallucinations, explained
    • Real AI hallucination examples
    • Why does AI hallucinate?
    • AI hallucination rates by model
    • Does ChatGPT make up sources?

    Detectors

    • Are AI detectors accurate?
    • Is ZeroGPT accurate?
    • Is GPTZero accurate?
    • Is Turnitin's AI detector accurate?
    • Is Grammarly's AI detector accurate?

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