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.

GG◑ Deprecating Grok 4.1 Fast Reasoning 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 → /sign-up