# GPT-4.5 release date

lineage: /models/gpt.md  

entity: /record/gpt-4-5.md  
predicate: model_release  
page: /record/gpt-4-5/model_release  
as_of: 2026-11-05  

As of November 5, 2026, the AsOf record says GPT-4.5 was released on February 27, 2025, from 2 primary sources (developers.openai.com and openai.com). The record holds 1 claim on GPT-4.5's release, 1 still open and 0 superseded, each dated and sourced; a replaced value is closed with an end date, never deleted.

## Current release date

What the record asserts on 2026-11-05.

- [GPT-4.5](/record/gpt-4-5.md) | model_release | GPT-4.5 | valid 2025-02-27 to present | conf 0.95 | valid | [clm_CD5AF70E4501](/claim/clm_CD5AF70E4501.md)
  sources: https://developers.openai.com/api/docs/changelog.md, https://openai.com/index/gpt-4-5-system-card, https://www.wikidata.org/wiki/Q132804879

## Every dated value

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 Superseded claims stay visible.

- [GPT-4.5](/record/gpt-4-5.md) | model_release | GPT-4.5 | valid 2025-02-27 to present | conf 0.95 | valid | [clm_CD5AF70E4501](/claim/clm_CD5AF70E4501.md)
  sources: https://developers.openai.com/api/docs/changelog.md, https://openai.com/index/gpt-4-5-system-card, https://www.wikidata.org/wiki/Q132804879

## Questions this record answers

### When was GPT-4.5 released?

On February 27, 2025, from 2 primary sources (developers.openai.com and openai.com) (status valid, confidence 0.95).


## Get this data

- JSON: /v1/entities/gpt-4-5/model_release (this fact) · /v1/entities/gpt-4-5?predicates=model_release (with the entity's coverage; add as_of=YYYY-MM-DD for a date)
- MCP: timeline(entity: "gpt-4-5", predicates: ["model_release"]) for every dated value · fetch(id: "/record/gpt-4-5/model_release.md") for this page
- Entity twin: /record/gpt-4-5.md · timeline: /timelines/gpt-4-5.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.