Grok 4 Fast vs Kimi K2
Grok 4 Fast offers 2.0M tokens context vs 131K tokens, Grok 4 Fast includes advanced reasoning, Grok 4 Fast supports vision. Compare full specs, pricing, and choose the best model for your use case.
Quick Overview
Detailed Comparison
Specification
Grok 4 Fast
Kimi K2
Provider
OpenRouter
OpenRouter
Context Window
2.0M tokens
131K tokens
Max Output Tokens
30K tokens
33K tokens
Input Pricing (per 1M tokens)
$0.20
$0.55
Output Pricing (per 1M tokens)
$0.50
$2.20
Release Date
Aug 2025
Jul 2025
Capabilities
Capability
Grok 4 Fast
Kimi K2
Text Generation
Vision
Function Calling
Advanced Reasoning
Which Model Should You Choose?
Choose Grok 4 Fast if:
- • You need a larger context window
- • Cost efficiency is a priority
- • You need advanced reasoning
Choose Kimi K2 if:
- • You prefer open weights