Grok 4 Fast (Non-Reasoning) vs Grok 3 Fast
The Grok 4 Fast (Non-Reasoning) AI model by xAI offers a larger context window of 2,000,000 tokens compared to the Grok 3 Fast model's 131,072 tokens. While Grok 4 Fast supports text, vision, and function calling tasks, Grok 3 Fast is limited to text input and function calling. With pricing at $0.2/M input and $0.5/M output tokens, Grok 4 Fast is ideal for data-intensive projects, while Grok 3 Fast, priced at $5/M input and $25/M output tokens, is better suited for tasks requiring in-depth analysis with smaller datasets.
Quick Overview
Grok 4 Fast (Non-Reasoning)
xAI
2.0M tokens context • $0.20 / $0.50 per 1M tokens
View full specifications →Detailed Comparison
Specification
Grok 4 Fast (Non-Reasoning)
Grok 3 Fast
Provider
xAI
xAI
Context Window
2.0M tokens
131K tokens
Max Output Tokens
30K tokens
8K tokens
Input Pricing (per 1M tokens)
$0.20
$5.00
Output Pricing (per 1M tokens)
$0.50
$25.00
Release Date
Sep 2025
Feb 2025
Capabilities
Capability
Grok 4 Fast (Non-Reasoning)
Grok 3 Fast
Text Generation
Vision
Function Calling
File Attachments
Which Model Should You Choose?
Choose Grok 4 Fast (Non-Reasoning) if:
- • You need a larger context window
- • Cost efficiency is a priority