# Grok 4 Fast (Reasoning) retired 2026-05-01 → Grok 4.1 Fast (Reasoning)

> Source: <https://llmstatus.ai/m/microsoft/microsoft/grok-4-fast-reasoning>
> Published: 2026-10-22 02:48:41+00:00

MF✕ Retired

# Grok 4 Fast (Reasoning)

Microsoft · grok-4-fast-reasoning

Azure-hosted lifecycle (may differ from provider-direct). 

[Provider statement →](https://models.dev/azure/grok-4-fast-reasoning)
groktext+image2000k context30k max out

also matches: 

`grok-4-fast-reasoning`` microsoft/grok-4-fast-reasoning`
[provider announcement →](https://models.dev/azure/grok-4-fast-reasoning)

Does your code call Grok 4 Fast (Reasoning)?

$ curl -fsSL https://llmstatus.ai/install.sh | bash

Then `mm status` in any repo — it finds every model you use and flags the ones on a clock. No account, nothing uploaded.

[Get alerted before it retires →](https://llmstatus.ai/sign-up)