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
SourceScore rates how reliable a source is to cite — for AI answers and research. This is one verified claim from the catalog.
Related verified claims
More verified claims related to this one — keep exploring.
Anthropic Claude Opus 4 released on: 2025-05-22 by Anthropic.
100% confidence · shares 4 tags (claude-4, anthropic, released_on…)
Anthropic Claude Code publicly released on: 2025-02-24 by Anthropic — coding agent CLI.
100% confidence · shares 3 tags (anthropic, released_on, 2025)
Anthropic Citations API publicly released on: 2025-01-23 by Anthropic — built-in source citations.
100% confidence · shares 3 tags (anthropic, released_on, 2025)
Claude 3.7 Sonnet publicly released on: 2025-02-24 by Anthropic — first hybrid-reasoning model with optional extended-thinking mode.
100% confidence · shares 3 tags (anthropic, released_on, 2025)
Anthropic Claude for Education publicly released on: 2025-04-02 by Anthropic — Learning mode + Claude API for education institutions + Northeastern + LSE + Champlain partnerships.
100% confidence · shares 3 tags (anthropic, released_on, 2025)
Anthropic Constitutional Classifiers publicly released on: 2025-02-04 by Anthropic — safeguard against jailbreaks via constitutional-trained input/output filters.
100% confidence · shares 3 tags (anthropic, released_on, 2025)
Anthropic Claude Sonnet 4.5 publicly released on: 2025-09-29 by Anthropic — production model improvements over Sonnet 4 with extended-thinking + better coding.
90% confidence · shares 3 tags (anthropic, released_on, 2025)
Anthropic Skills publicly released on: 2025-10-16 by Anthropic — Claude can use named skills (curated capability packs).
90% confidence · shares 3 tags (anthropic, released_on, 2025)
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 →
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 claim record + top cited 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
Frequently asked questions
How has SourceScore reviewed the claim "Anthropic Claude Sonnet 4 released on: 2025-05-22 by Anthropic."?
SourceScore records this assertion with 100% legacy editorial confidence as of 2026-05-16, under methodology veritas-v0.1. That metadata is not a truth guarantee. Inspect the 2 cited source record(s), excerpts, and live evidence below.
What is the evidence for "Anthropic Claude Sonnet 4 released on: 2025-05-22 by Anthropic."?
The record lists 2 cited source(s): Anthropic, Anthropic. Each is shown below with a short excerpt and URL. The JSON record at https://sourcescore.org/api/v1/claims/f82eba5c7f5fa09f.json includes SourceScore-issued HMAC integrity metadata, not a public verification proof.
When was this claim record last reviewed by SourceScore?
Last reviewed 2026-05-16 under methodology version veritas-v0.1. The dated JSON record includes SourceScore-issued HMAC metadata, which is not publicly recomputable. Refetch the record and inspect current evidence before relying on it.
How can I cite this SourceScore claim in my code or article?
Fetch the JSON record from https://sourcescore.org/api/v1/claims/f82eba5c7f5fa09f.json, including the verbatim claim, cited evidence, confidence, methodology version, and last-verified date. Refetch the canonical HTTPS record and inspect cited evidence; the HMAC tag is not publicly independently verifiable. The CC-BY-4.0 license permits commercial use with attribution to SourceScore.
Use this claim in your code
Fetch this record from your application. The response includes verbatim excerpts, primary-source URLs, and SourceScore-issued HMAC integrity metadata. Refetch the canonical HTTPS record and inspect cited evidence; public users cannot independently verify the HMAC tag.
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()