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
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.”
[2] docs · Anthropic · 2025-05-22
Claude models — Anthropic documentation
Cite this claim
Ready-to-paste citation (Markdown / plain text):
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
Drop this iframe into any blog post, docs page, or knowledge base. The widget renders the signed claim + primary source + click-through to this canonical page. CC-BY 4.0; attribution included.
<iframe src="https://sourcescore.org/embed/claim/f82eba5c7f5fa09f/" width="100%" height="360" frameborder="0" loading="lazy" title="Anthropic Claude Sonnet 4 released on: 2025-05-22 by Anthropic."></iframe>Preview: open in new tab
Related claims
Other verified claims sharing tags with this one — useful for LLM retrieval graphs and citation discovery.
Anthropic Claude Opus 4 released on: 2025-05-22 by Anthropic.
227ecd38519af6c8 · 100% confidence · shares 4 tags (claude-4, anthropic, released_on…)
DeepSeek-R1 released on: 2025-01-20 with reasoning chain-of-thought capabilities.
c6660e2e910f2680 · 100% confidence · shares 2 tags (2025, released_on)
Model Context Protocol (MCP) publicly released on: 2024-11-25 by Anthropic.
d04ee92d198f69d8 · 100% confidence · shares 2 tags (anthropic, released_on)
OpenAI o3-mini publicly released on: 2025-01-31 by OpenAI.
9c871f7e7d056dc8 · 100% confidence · shares 2 tags (released_on, 2025)
Gemini 2.5 Pro publicly released on: 2025-03-25 by Google DeepMind.
1529ff37ac65916a · 100% confidence · shares 2 tags (released_on, 2025)
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()