Grok 4.1 Fast Reasoning

JSON →
xai llm
text

Latest version of the fast reasoning variant of Grok 4.1, optimized for rapid inference with chain-of-thought reasoning.

context window 2.0M tokens
max output 2.0M tokens
input price $0.2 / 1M tokens
output price $0.5 / 1M tokens
reasoningstreamingcode-generationfunction-callingtool-usevisionprompt-cachingjson-mode