AsOf

Claude Opus 4.8 · context window1M token context window

valid: Two independent sources agree, or a primary source states it: the record asserts this claim, unless it is a post, is marked for review or carries a confidence below 0.5.asserted

What the statuses mean

Valid from
2026-05-28
Valid until
still holds
Published
2026-05-28
Recorded by AsOf
2026-11-11
Checked
2026-11-11 · its source page states the value and the date
Confidence
0.70

Sources

“May 28, 2026 We’ve launched Claude Opus 4.8 ( claude-opus-4-8 ), our most capable model. Claude Opus 4.8 supports a 1M token context window by default on the Claude API, Amazon Bedrock, Google Cloud, and Microsoft Foundry, 128k max output tokens”— what the page says, read 2026-11-11

Cite this claim

Each form names the value, its as-of date (2026-05-28), the day you read it (2026-11-11), the claim's stable URL and id and its primary source. The URL never changes: a superseded claim stays at the same address.

Plain text
AsOf. "Claude Opus 4.8 context window: 1M token context window", as of 2026-05-28. Claim clm_34EE9AAE8E66, https://asof.is/claim/clm_34EE9AAE8E66, accessed 2026-11-11. Source: https://platform.claude.com/docs/en/release-notes/overview#2026-05-28.
APA
AsOf. (2026). Claude Opus 4.8 context window: 1M token context window (as of 2026-05-28) [Record clm_34EE9AAE8E66]. Retrieved November 11, 2026, from https://asof.is/claim/clm_34EE9AAE8E66 (source: https://platform.claude.com/docs/en/release-notes/overview#2026-05-28)
BibTeX
@misc{asof_clm_34EE9AAE8E66,
  author = {AsOf},
  title = {Claude Opus 4.8 context window: 1M token context window},
  year = {2026},
  howpublished = {\url{https://asof.is/claim/clm_34EE9AAE8E66}},
  note = {Claim clm\_34EE9AAE8E66, as of 2026-05-28; source: https://platform.claude.com/docs/en/release-notes/overview\#2026-05-28},
  urldate = {2026-11-11}
}

On the record

/claim/clm_34EE9AAE8E66.md/v1/claims/clm_34EE9AAE8E66submit a correction