Grok 4 Blog

Grok-4-fast API
Sep 30, 2025
Grok 4
Grok 4 Fast
grok 4
Grok 4 Fast

Grok-4-fast API

Grok-4-Fast is xAI’s new cost-efficient reasoning model designed to make high-quality reasoning and web search capabilities cheaper and faster for both consumer and developer use. xAI positions it as a frontier offering that preserves Grok-4’s benchmark performance while improving token efficiency, and ships two variants tuned for either reasoning or non-reasoning workloads.