Grok 4.1 Fast is xAI's best tool-calling model with a 2M context window. It reasons and completes agentic tasks accurately and rapidly, excelling at complex real-world use cases such as customer support and finance. To optimize for maximal intelligence use this variant. Otherwise, use the non-reasoning version.
Try Now2,000,000 tokens
256,000 tokens
3.4x (above average)
$0.20 per 1M tokens
$0.50 per 1M tokens
20 files
Yes
$0 per month