# 2023-09-23

What the record holds about this day.


## Became true

- [Anthropic](/record/anthropic.md) | announcement | Prompting Claude's long context window | valid 2023-09-23 to present | conf 0.50 | valid | [clm_6CA101A61E09](/claim/clm_6CA101A61E09.md)

## Stopped being true

- none

## Recorded or changed on this day

- none

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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.