Verified claim · AI-ML · 100% confidence
Claude 3 Opus context window tokens: 200000.
Last verified 2026-05-16 · Methodology veritas-v0.1 · 565df27fc8b75ef0
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Structured fields
- Subject
- Claude 3 Opus
- Predicate
context_window_tokens- Object
- 200000
- Confidence
- 100%
- Tags
- claude-3 · opus · anthropic · context · 200k
Sources (2)
[1] official blog · Anthropic · 2024-03-04
Introducing the next generation of Claude“All Claude 3 models … offer a 200K context window at launch.”
Anthropic is rated by SourceScore — see its reliability →[2] docs · Anthropic
Claude models — context length referenceAnthropic is rated by SourceScore — see its reliability →
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Ready-to-paste citation (Markdown / plain text):
Claude 3 Opus context window tokens: 200000. — SourceScore Claim 565df27fc8b75ef0 (verified 2026-05-16). https://sourcescore.org/api/v1/claims/565df27fc8b75ef0.jsonEmbed this claim
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Anthropic founded in: 2021.
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Frequently asked questions
Is the claim "Claude 3 Opus context window tokens: 200000." 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 "Claude 3 Opus context window tokens: 200000."?
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/565df27fc8b75ef0.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/565df27fc8b75ef0.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/565df27fc8b75ef0.jsonJavaScript / TypeScript
const r = await fetch("https://sourcescore.org/api/v1/claims/565df27fc8b75ef0.json");
const envelope = await r.json();
console.log(envelope.claim.statement);
// "Claude 3 Opus context window tokens: 200000."Python
import httpx
r = httpx.get("https://sourcescore.org/api/v1/claims/565df27fc8b75ef0.json")
envelope = r.json()
print(envelope["claim"]["statement"])
# "Claude 3 Opus context window tokens: 200000."LangChain (retrieve-then-cite)
from langchain_core.tools import tool
import httpx
@tool
def get_claude_3_opus_fact() -> dict:
"""Fetch the verified SourceScore claim for Claude 3 Opus."""
r = httpx.get("https://sourcescore.org/api/v1/claims/565df27fc8b75ef0.json")
return r.json()