# Grok 4 Fast retirement

entity: /record/grok-4-fast.md  
predicate: retired  
page: /record/grok-4-fast/retired  
as_of: 2026-11-04  

As of November 4, 2026, the AsOf record says Grok 4 Fast was retired on May 15, 2026 (as grok-4-fast-reasoning), from a primary source (docs.x.ai). The record holds 1 claim on Grok 4 Fast's retirement, 1 still open and 0 superseded, each dated and sourced; a replaced value is closed with an end date, never deleted.

## Current retirement

What the record asserts on 2026-11-04.

- [Grok 4 Fast](/record/grok-4-fast.md) | retired | grok-4-fast-reasoning | valid 2026-05-15 to present | conf 0.95 | valid | [clm_88F24D97EEE0](/claim/clm_88F24D97EEE0.md)
  sources: https://docs.x.ai/developers/migration/may-15-retirement

## Every dated value

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 Superseded claims stay visible.

- [Grok 4 Fast](/record/grok-4-fast.md) | retired | grok-4-fast-reasoning | valid 2026-05-15 to present | conf 0.95 | valid | [clm_88F24D97EEE0](/claim/clm_88F24D97EEE0.md)
  sources: https://docs.x.ai/developers/migration/may-15-retirement

## Questions this record answers

### When was Grok 4 Fast retired?

On May 15, 2026 (as grok-4-fast-reasoning), from a primary source (docs.x.ai) (status valid, confidence 0.95).


## Get this data

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