Grok 4.1 Fast Reasoning
JSON →A fast inference variant of Grok 4.1 optimized for reasoning tasks.
Specs
context window 2.0M tokens
max output 2.0M tokens
input price $0.2 / 1M tokens
output price $0.5 / 1M tokens
Capabilities
streamingreasoningcode-generationfunction-callingtool-usevisionprompt-cachingjson-mode
API
full doc /v1/models/grok-4-1-fast-reasoning