Verified claim · AI-ML · 100% confidence
Anthropic Claude Sonnet 4 released on: 2025-05-22 by Anthropic.
Last verified 2026-05-16 · Methodology veritas-v0.1 · f82eba5c7f5fa09f
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Structured fields
- Subject
- Anthropic Claude Sonnet 4
- Predicate
released_on- Object
- 2025-05-22 by Anthropic
- Confidence
- 100%
- Tags
- claude-sonnet-4 · claude-4 · anthropic · released_on · 2025
Sources (2)
[1] official blog · Anthropic · 2025-05-22
Introducing Claude 4 — Sonnet 4 and Opus 4“Claude Sonnet 4 is a significant upgrade to Claude Sonnet 3.5, delivering superior coding and reasoning while responding more precisely to your instructions.”
Anthropic is rated by SourceScore — see its reliability →[2] docs · Anthropic · 2025-05-22
Claude models — Anthropic documentationAnthropic is rated by SourceScore — see its reliability →
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Anthropic Claude Sonnet 4 released on: 2025-05-22 by Anthropic. — SourceScore Claim f82eba5c7f5fa09f (verified 2026-05-16). https://sourcescore.org/api/v1/claims/f82eba5c7f5fa09f.jsonEmbed this claim
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Frequently asked questions
Is the claim "Anthropic Claude Sonnet 4 released on: 2025-05-22 by Anthropic." verified?
Yes — SourceScore verified this claim with 100% confidence as of 2026-05-16. The verification uses 2 primary sources cross-referenced against the SourceScore methodology (version veritas-v0.1). Full source list + signed JSON envelope linked below.
What is the evidence for "Anthropic Claude Sonnet 4 released on: 2025-05-22 by Anthropic."?
Evidence comes from 2 primary sources: Anthropic, Anthropic. Each source is listed below with verbatim excerpts and URLs. The signed JSON envelope at https://sourcescore.org/api/v1/claims/f82eba5c7f5fa09f.json includes an HMAC-SHA256 signature for audit verification.
When was this claim last verified by SourceScore?
Last verified 2026-05-16 under methodology version veritas-v0.1. The signed JSON envelope is dated and cryptographically signed for audit trail. Re-verification cadence depends on the claim type and source freshness.
How can I cite this SourceScore claim in my code or article?
Fetch the signed JSON envelope from https://sourcescore.org/api/v1/claims/f82eba5c7f5fa09f.json which includes the verbatim claim, primary sources, confidence, methodology version, last-verified date, and HMAC-SHA256 signature for audit. The CC-BY-4.0 license permits commercial use with attribution to SourceScore.
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/f82eba5c7f5fa09f.jsonJavaScript / TypeScript
const r = await fetch("https://sourcescore.org/api/v1/claims/f82eba5c7f5fa09f.json");
const envelope = await r.json();
console.log(envelope.claim.statement);
// "Anthropic Claude Sonnet 4 released on: 2025-05-22 by Anthropic."Python
import httpx
r = httpx.get("https://sourcescore.org/api/v1/claims/f82eba5c7f5fa09f.json")
envelope = r.json()
print(envelope["claim"]["statement"])
# "Anthropic Claude Sonnet 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_sonnet_4_fact() -> dict:
"""Fetch the verified SourceScore claim for Anthropic Claude Sonnet 4."""
r = httpx.get("https://sourcescore.org/api/v1/claims/f82eba5c7f5fa09f.json")
return r.json()