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OpenTruth

The Pipeline

From content to verdict in 5 minutes

Our AI pipeline analyzes every political claim, searches reliable sources, and produces a transparent, traceable verdict.

OpenTruth fact-checking pipeline: Video ingestion, claim extraction, source verification, verdict publication

The Pipeline

1

Transcription

30s–1min

The content is automatically transcribed to text. We use platform subtitles when available (YouTube, Instagram, TikTok), then OpenAI's Whisper transcription model as fallback. The raw text is then split into coherent thematic segments.

Multi-platform ingestionWhisper AIThematic segmentation
Transcription
2

Context analysis

15–30s

Before any verification, we analyze the context: who is speaking, in what setting (Parliament, studio, rally), and on what date. This step ensures claims are correctly contextualized.

Speaker IDSetting detectionDate extraction
3

Claim extraction

1–2min

An AI model reads each segment and identifies verifiable claims - factual statements that can be confirmed or refuted by public sources. Opinions, political promises, and satire are identified as such and are not submitted for verification.

Factual claimsOpinion detectionSatire filtering
Claim extraction
4

Source research

1–2min

For each claim, our system searches reliable sources on the web: government sites, official institutions, academic publications, reference media. Up to 15 research iterations per claim to maximize evidence coverage.

Government dataAcademic papersOfficial statisticsUp to 15 iterations
5

Dual AI verification

30s–1min

Each claim-source pair is submitted to two independent AI models: a multilingual model specialized in French, German, Italian and English, and a high-precision model specialized in English sources. Both models vote independently - the same principle as double review in journalism.

Two independent modelsMultilingual NLIDouble review
Dual AI verification
6

Score & verdict

Instant

A validity score (0–100%) is calculated combining source concordance (60%) and source quality (40%). This score determines the final verdict on an 8-level scale from True to False, plus Opinion and Satire categories.

Concordance 60%Quality 40%8-level scaleConfidence score
Score & verdict

The verdict scale

8 levels of assessment, from confirmed facts to identified satire. Each verdict includes its confidence score and full source chain.

Verdict scale from Verified True (1) to False (8)
True

Confirmed by primary or official sources

Mostly true

Confirmed with minor nuances

Mixed

Some elements confirmed AND some refuted

Misleading

Technically true but taken out of context

False

Contradicted by reliable sources

Unverifiable

Insufficient sources to conclude

Opinion

Value judgment, not a verifiable fact

Satire

Humorous or satirical content identified

11 common claim type categories: statistical, prediction, causal, comparison, historical, legal, scientific, economic, environmental, social, political

Our limitations - in full transparency

What AI does well

  • Process a large volume of claims quickly (50+ in 5 minutes)
  • Find official and institutional sources
  • Apply an identical process to every claim (no editorial bias)

What AI finds harder

  • Irony and satire: may confuse a joke with a factual claim
  • Implicit context: misses context only a subject expert would know
  • Nuanced phrasing: French political conditionals and litotes are challenging
  • Complex statistics: multi-variable comparisons are harder to verify

Our main model achieves 82.3% accuracy on French-language benchmarks. On specific political text, we estimate accuracy at 77–80%. That's why we use two independent models, always display the confidence score, provide source links for independent verification, and allow journalists to correct verdicts.

Correcting a verdict

Every verdict is versioned. If a verdict is modified, the previous version is archived - never deleted. Report an error via the 'Contest this verdict' button in the app or by email at corrections@opentruth.ch.

We commit to reviewing every report within 48 hours.

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