Grok 4.20 Beta

xAI

Latest Grok model with 2M context window and fastest output speed of any tracked model (265 tok/s). Available in reasoning and non-reasoning variants.

Text Generation API Latest Grok Family v4.20
Documentation Back to Models
Parameters
-
params
Context Window
2.0M
tokens
Max Output
-
tokens
Input Price
$2.0000
per 1M tokens
Output Price
$6.0000
per 1M tokens

Grok Family Timeline 8 versions

Grok 4.20 Beta Current Latest api
Mar 2026
Grok 4.1 Fast api
Nov 2025
Grok 4.1 api
Nov 2025
Grok Code Fast 1 api
Aug 2025
Grok 4 api
Jul 2025
Grok 3 Mini api
Mar 2025
Grok 3 api
Feb 2025
Grok 2 api
-

Capabilities

👁️
Vision
⚡
Function Calling
📋
JSON Mode
🌊
Streaming
💬
System Prompt
🖥️
Code Execution
🔍
Web Search
🔌
MCP Support

Extended Pricing

Input
$2.0000/1M
Output
$6.0000/1M
Cache Read
$0.2000/1M

Details

Release Date
March 10, 2026
Knowledge Cutoff
November 1, 2024
Source
API
API Key Required
Yes
License
Proprietary
Model ID
grok-4.20-beta
Last updated: March 13, 2026