# Claude Opus 5.5 timeline

entity: /record/claude-opus-5-5.md  
id: ent_claude-opus-5-5  


## 2026

- 2026-09-22 | context_window | 1M tokens | valid | [clm_C8F8497EE25C](/claim/clm_C8F8497EE25C.md)
- 2026-09-22 | model_release | Claude Opus 5.5 | valid | [clm_F93B2A65D6D9](/claim/clm_F93B2A65D6D9.md)
- 2026-09-22 | price | $4 per million input tokens | valid | [clm_1517D02FAFA4](/claim/clm_1517D02FAFA4.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.