# Claude Sonnet 4.5

id: ent_claude-sonnet-4-5  
kind: product  
timeline: /timelines/claude-sonnet-4-5.md  
page: /record/claude-sonnet-4-5  
same_as: https://asof.is/record/claude-sonnet-4-5 (how to cite the id: /identifiers.md)  

Sonnet model for complex agents and coding

## Fact pages

One page per fact: the current value with its sources, then every dated value and what replaced what. Fetch any of them as markdown.

- [Claude Sonnet 4.5 release date](/record/claude-sonnet-4-5/model_release.md)
- [Claude Sonnet 4.5 deprecation](/record/claude-sonnet-4-5/deprecated.md)

## All claims

One claim per line, newest first. Superseded claims stay visible.

- [Claude Sonnet 4.5](/record/claude-sonnet-4-5.md) | deprecated | claude-sonnet-4-5-20250929 | valid 2026-09-30 to present | conf 0.95 | valid | [clm_CDD27AF61D3F](/claim/clm_CDD27AF61D3F.md)
  sources: https://platform.claude.com/docs/en/about-claude/model-deprecations

## Posts and Hugging Face repos (1)

Dated items from the entity's own feeds, and the days its Hugging Face repositories were created, newest first.

- [Claude Sonnet 4.5](/record/claude-sonnet-4-5.md) | model_release | Claude Sonnet 4.5 | valid 2025-09-29 to present | conf 0.95 | valid | [clm_5B3CB4F2F885](/claim/clm_5B3CB4F2F885.md)
  sources: https://platform.claude.com/docs/en/release-notes/overview

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AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.