AsOf

Claude Opus 4.1 · retiredClaude Opus 4.1

valid: Two independent sources agree, or a primary source states it: the record asserts this claim.asserted

What the statuses mean

Valid from
2026-08-05
Valid until
still holds
Published
2026-08-05
Recorded by AsOf
2026-11-09
Checked
2026-11-09 · its source page states the value and the date
Confidence
0.70

Sources

“We’ve retired the Claude Opus 4.1 model ( claude-opus-4-1-20250805 ). All requests to this model on the Claude API will now return an error.”— what the page says, read 2026-11-09

Cite this claim

Each form names the value, its as-of date (2026-08-05), the day you read it (2026-11-09), 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 The URL never changes: a superseded claim stays at the same address.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 4.1 retired: Claude Opus 4.1", as of 2026-08-05. Claim clm_C828CD007200, https://asof.is/claim/clm_C828CD007200, accessed 2026-11-09. Source: https://platform.claude.com/docs/en/release-notes/overview#2026-08-05.
APA
AsOf. (2026). Claude Opus 4.1 retired: Claude Opus 4.1 (as of 2026-08-05) [Record clm_C828CD007200]. Retrieved November 9, 2026, from https://asof.is/claim/clm_C828CD007200 (source: https://platform.claude.com/docs/en/release-notes/overview#2026-08-05)
BibTeX
@misc{asof_clm_C828CD007200,
  author = {AsOf},
  title = {Claude Opus 4.1 retired: Claude Opus 4.1},
  year = {2026},
  howpublished = {\url{https://asof.is/claim/clm_C828CD007200}},
  note = {Claim clm\_C828CD007200, as of 2026-08-05; source: https://platform.claude.com/docs/en/release-notes/overview\#2026-08-05},
  urldate = {2026-11-09}
}

On the record

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