AsOf

Claude Sonnet 4.5 · model releaseSonnet 4.5

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

What the statuses mean

Valid from
2025-09-29
Valid until
still holds
Published
2025-09-29
Recorded by AsOf
2026-11-08
Checked
2026-11-08 · its source page states the value and the date
Confidence
0.70

Sources

“September 29, 2025 Claude Sonnet 4.5 launch We released our newest model, Sonnet 4.5.”— what the page says, read 2026-11-08

Cite this claim

Each form names the value, its as-of date (2025-09-29), 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 The URL never changes: a superseded claim stays at the same address.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 Sonnet 4.5 model release: Sonnet 4.5", as of 2025-09-29. Claim clm_D58BE2DA9452, https://asof.is/claim/clm_D58BE2DA9452, accessed 2026-11-09. Source: https://support.claude.com/en/articles/12138966-release-notes#2025-09-29.
APA
AsOf. (2025). Claude Sonnet 4.5 model release: Sonnet 4.5 (as of 2025-09-29) [Record clm_D58BE2DA9452]. Retrieved November 9, 2026, from https://asof.is/claim/clm_D58BE2DA9452 (source: https://support.claude.com/en/articles/12138966-release-notes#2025-09-29)
BibTeX
@misc{asof_clm_D58BE2DA9452,
  author = {AsOf},
  title = {Claude Sonnet 4.5 model release: Sonnet 4.5},
  year = {2025},
  howpublished = {\url{https://asof.is/claim/clm_D58BE2DA9452}},
  note = {Claim clm\_D58BE2DA9452, as of 2025-09-29; source: https://support.claude.com/en/articles/12138966-release-notes\#2025-09-29},
  urldate = {2026-11-09}
}

On the record

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