Grok 4.1 Fast Reasoning API
About
Build advanced reasoning agents with Grok 4.1 Fast Reasoning, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.20/1M input and $0.50/1M output tokens, native tool calling support. Access Grok 4.1 Fast Reasoning via the Vercel AI Gateway API with up to 1.0M output tokens.
Capabilities
Input Modalities
textimagepdf
Output Modalities
text
Limits
Context Window
1.0M
Tokens
Input Limit
1.0M
Tokens
Max Output
1.0M
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.20
Output
$0.50
Caching (per 1M tokens)
Read
$0.05
Frequently Asked Questions
Grok 4.1 Fast Reasoning by Vercel AI Gateway costs $0.20 per 1M input tokens and $0.50 per 1M output tokens. Cached reads cost $0.05 per 1M tokens.
Model Details
ID
xai/grok-4.1-fast-reasoning
Provider
Vercel AI GatewayFamily
grok
Release Date
Nov 19, 2025
Knowledge Cutoff
Oct 1, 2024
API Integration