Alex Getmanearly AI signals
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UpdatedxAIgrok-4.1-fast

Grok 4.1 Fast Reasoning spotted on Arena

Confirmed · 14 evidence linksFirst seen Updated Recorded automatically by Signal Forge

Grok 4.1 Fast Reasoning is a model from xAI, released on 19 Nov 2025. First seen 11 Sep 2026. Catalogues list a 2,000,000 tokens context window. 14 evidence links.

Facts as of

Context window
2,000,000
Max output
30,000
Input
image · text
Output
text

Alex's take

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Evidence links 14

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