# Claude Sonnet 4.5 timeline

entity: /record/claude-sonnet-4-5.md  
id: ent_claude-sonnet-4-5  


## 2025

- 2025-09-29 | model_release | Claude Sonnet 4.5 | valid | [clm_5B3CB4F2F885](/claim/clm_5B3CB4F2F885.md)

## 2026

- 2026-09-30 | deprecated | claude-sonnet-4-5-20250929 | valid | [clm_CDD27AF61D3F](/claim/clm_CDD27AF61D3F.md)

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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.