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[ARTICLE · art-126128] src=llmstatus.ai ↗ pub= topic=large-language-models verified=true sentiment=· neutral

Grok 4.1 Fast (Reasoning) deprecated

XAI's Grok 4.1 Fast (Reasoning) model, released 2025-11-19 with a 128k context window and 30k max output, has been marked deprecated with no announced retirement date, according to a provider announcement tracked by models.dev. The model is listed under the identifier xai/grok-4.1-fast-reasoning on Google Vertex, and the deprecation notice directs developers to a tool that scans repositories for models facing retirement.

read1 min views1 publishedSep 10, 2026
Grok 4.1 Fast (Reasoning) deprecated
Image: Llmstatus (auto-discovered)

GG◑ Deprecating

Google · xai/grok-4.1-fast-reasoning

Released2025-11-19

Retiresno announced date

groktext+image128k context30k max out

also matches:

`xai/grok-4.1-fast-reasoning`` google/xai/grok-4.1-fast-reasoning`
[provider announcement →](https://models.dev/google-vertex/xai/grok-4.1-fast-reasoning)

Does your code call Grok 4.1 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 →

source & further reading
llmstatus.ai — original article New model: GPT-5.6 Sol (US) (Amazon) New model: Grok 4.6 (Global) (Amazon) New model: Grok 4.6 (US) (Amazon)
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