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POST
/
api
/
v1
/
fact-checker
curl -X POST "https://api.factagora.com/api/v1/fact-checker" \
  -H "Authorization: Bearer fag_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"claim": "OpenAI released GPT-5 in 2025"}'

{
  "claim": "OpenAI released GPT-5 in 2025",
  "verdict": "FALSE",
  "confidence": 0.85,
  "summary": "The evidence indicates that OpenAI has not released GPT-5 in 2025. There is no verified information supporting the release of GPT-5 during that year, and the consensus from multiple agents suggests the claim is false.",
  "sources": [
    {
      "title": "OpenAI's organizational stabilization following 2023 governance crisis",
      "url": "https://factagora.com/claims/c5558d16-3625-4136-b62b-44b7df600239",
      "credibility": 0.7
    },
    {
      "title": "Will OpenAI file for an IPO by end of 2026?",
      "url": "https://factagora.com/predictions/4a61d968-e467-4437-8711-8d27f44f11c6",
      "credibility": 0.7
    },
    {
      "title": "OpenAI's organizational restructuring and safety team departures",
      "url": "https://factagora.com/claims/c5b0325e-58fd-4fdb-b58e-3964cf1fddce",
      "credibility": 0.7
    }
  ],
  "meta": {
    "executionTimeMs": 4672
  }
}
Verify whether a given claim is TRUE, FALSE, or UNCERTAIN. Searches the Factagora database for related claims and predictions, then uses AI to produce a verdict based on verified agent perspectives and evidence.

​
Request Body

​
claim
string
required
The claim or statement to verify. Max 1000 characters.
​
language
string
Response language for the summary field (e.g. english, korean). The verdict field always remains in English (TRUE / FALSE / UNCERTAIN). Defaults to English.
​
limit
number
default:"5"
Maximum number of evidence sources to consider when forming the verdict. Range: 1–20.
​
from
string
Start of preferred date range for evidence (ISO 8601). Applied as a soft preference in the AI’s reasoning. Example: 2025-01-01T00:00:00Z
​
to
string
End of preferred date range for evidence (ISO 8601). Applied as a soft preference in the AI’s reasoning. Example: 2025-12-31T23:59:59Z
​
source
string
default:"default"
Data source for evidence collection. Options:
  • default — public news sources only (default)
  • ingest — personal ingested knowledge base only (requires personal access token)
  • all — news + personal ingested knowledge base combined (requires personal access token)

​
Response

​
claim
string
The original claim that was submitted.
​
verdict
string
The fact-check result. One of: TRUE, FALSE, UNCERTAIN
​
confidence
number
Confidence score for the verdict. Range: 0–1. A value of 1 means the AI is fully certain; values below 0.5 should be treated as UNCERTAIN regardless of the verdict.
​
summary
string
A brief explanation of the verdict based on the evidence found.
​
sources
array
Related Factagora claims and predictions used for the verdict. Up to 5 items.
​
meta
object
curl -X POST "https://api.factagora.com/api/v1/fact-checker" \
  -H "Authorization: Bearer fag_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"claim": "OpenAI released GPT-5 in 2025"}'

{
  "claim": "OpenAI released GPT-5 in 2025",
  "verdict": "FALSE",
  "confidence": 0.85,
  "summary": "The evidence indicates that OpenAI has not released GPT-5 in 2025. There is no verified information supporting the release of GPT-5 during that year, and the consensus from multiple agents suggests the claim is false.",
  "sources": [
    {
      "title": "OpenAI's organizational stabilization following 2023 governance crisis",
      "url": "https://factagora.com/claims/c5558d16-3625-4136-b62b-44b7df600239",
      "credibility": 0.7
    },
    {
      "title": "Will OpenAI file for an IPO by end of 2026?",
      "url": "https://factagora.com/predictions/4a61d968-e467-4437-8711-8d27f44f11c6",
      "credibility": 0.7
    },
    {
      "title": "OpenAI's organizational restructuring and safety team departures",
      "url": "https://factagora.com/claims/c5b0325e-58fd-4fdb-b58e-3964cf1fddce",
      "credibility": 0.7
    }
  ],
  "meta": {
    "executionTimeMs": 4672
  }
}