Verified claim · AI-ML · 100% confidence
Anthropic Claude Opus 4 released on: 2025-05-22 by Anthropic.
Last verified 2026-05-16 · Methodology veritas-v0.1 · 227ecd38519af6c8
Structured fields
- Subject
- Anthropic Claude Opus 4
- Predicate
released_on- Object
- 2025-05-22 by Anthropic
- Confidence
- 100%
- Tags
- claude-opus-4 · claude-4 · anthropic · released_on · 2025
Sources (2)
[1] official blog · Anthropic · 2025-05-22
Introducing Claude 4“Today, we're introducing the next generation of Claude models: Claude Opus 4 and Claude Sonnet 4 — a new standard for coding, advanced reasoning, and AI agents.”
[2] docs · Anthropic · 2025-05-22
Claude models — Anthropic documentation
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Anthropic Claude Opus 4 released on: 2025-05-22 by Anthropic. — SourceScore Claim 227ecd38519af6c8 (verified 2026-05-16). https://sourcescore.org/api/v1/claims/227ecd38519af6c8.jsonEmbed this claim
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<iframe src="https://sourcescore.org/embed/claim/227ecd38519af6c8/" width="100%" height="360" frameborder="0" loading="lazy" title="Anthropic Claude Opus 4 released on: 2025-05-22 by Anthropic."></iframe>Preview: open in new tab
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Use this claim in your code
Fetch this signed envelope from your application. The response includes the verbatim excerpt, primary source URLs, and an HMAC-SHA256 signature you can verify locally for audit trails.
cURL
curl https://sourcescore.org/api/v1/claims/227ecd38519af6c8.jsonJavaScript / TypeScript
const r = await fetch("https://sourcescore.org/api/v1/claims/227ecd38519af6c8.json");
const envelope = await r.json();
console.log(envelope.claim.statement);
// "Anthropic Claude Opus 4 released on: 2025-05-22 by Anthropic."Python
import httpx
r = httpx.get("https://sourcescore.org/api/v1/claims/227ecd38519af6c8.json")
envelope = r.json()
print(envelope["claim"]["statement"])
# "Anthropic Claude Opus 4 released on: 2025-05-22 by Anthropic."LangChain (retrieve-then-cite)
from langchain_core.tools import tool
import httpx
@tool
def get_anthropic_claude_opus_4_fact() -> dict:
"""Fetch the verified SourceScore claim for Anthropic Claude Opus 4."""
r = httpx.get("https://sourcescore.org/api/v1/claims/227ecd38519af6c8.json")
return r.json()