Grok 3 Fast vs Grok 4
Grok 4 offers 256K tokens context vs 131K tokens, Grok 4 is more cost-effective, Grok 4 includes advanced reasoning. Compare full specs, pricing, and choose the best model for your use case.
Quick Overview
Detailed Comparison
Specification
Grok 3 Fast
Grok 4
Provider
xAI
xAI
Context Window
131K tokens
256K tokens
Max Output Tokens
8K tokens
64K tokens
Input Pricing (per 1M tokens)
$5.00
$3.00
Output Pricing (per 1M tokens)
$25.00
$15.00
Release Date
Feb 2025
Jul 2025
Capabilities
Capability
Grok 3 Fast
Grok 4
Text Generation
Function Calling
Advanced Reasoning
Which Model Should You Choose?
Choose Grok 3 Fast if:
Choose Grok 4 if:
- • You need a larger context window
- • Cost efficiency is a priority
- • You need advanced reasoning