Fact Checker

{
  "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
  }
}

POST

api

fact-checker

{
  "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

string

required

The claim or statement to verify. Max 1000 characters.

string

Response language for the summary field (e.g. english, korean). The verdict field always remains in English (TRUE / FALSE / UNCERTAIN). Defaults to English.

number

default:"5"

Maximum number of evidence sources to consider when forming the verdict. Range: 1–20.

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

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

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

string

The original claim that was submitted.

string

The fact-check result. One of: TRUE, FALSE, UNCERTAIN

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.

string

A brief explanation of the verdict based on the evidence found.

array

Related Factagora claims and predictions used for the verdict. Up to 5 items.

Show Source fields

string

Title of the related claim or prediction

string

Link to the claim or prediction on Factagora. Format: https://factagora.com/claims/{uuid} or https://factagora.com/predictions/{uuid}

number

Credibility score of the source. Range: 0–1.

object

Show Meta fields

number

Total response time in milliseconds, including database search and AI inference.

cURL

curl -X POST "https://api.factagora.com/api/v1/fact-checker" \
  -H "Authorization: Bearer fa_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"claim": "The ECB raised interest rates in June 2024."}'

Python

resp = requests.post(
    "https://api.factagora.com/api/v1/fact-checker",
    headers={"Authorization": "Bearer fa_your_api_key"},
    json={"claim": "The ECB raised interest rates in June 2024."},
)
result = resp.json()

TypeScript

const resp = await fetch("https://api.factagora.com/api/v1/fact-checker", {
  method: "POST",
  headers: {
    Authorization: "Bearer fa_your_api_key",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    claim: "The ECB raised interest rates in June 2024.",
  }),
});
const result = await resp.json();

{
  "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
  }
}

Overview

Endpoints

Best Practices

Request Body

Response

​Request Body

​Response

Request Body

Response