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Kilo Gateway

xAI: Grok 4.20 API

Kilo Gateway
About

Build advanced reasoning agents with xAI: Grok 4.20, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $2.00/1M input and $6.00/1M output tokens, native tool calling support. Access xAI: Grok 4.20 via the Kilo Gateway API with up to 2.0M output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
2.0M

Tokens

Input Limit
2.0M

Tokens

Max Output
2.0M

Tokens

Pricing

Standard (per 1M tokens)

Input
$2.00
Output
$6.00

Caching (per 1M tokens)

Read
$0.20
Frequently Asked Questions

xAI: Grok 4.20 by Kilo Gateway costs $2.00 per 1M input tokens and $6.00 per 1M output tokens. Cached reads cost $0.20 per 1M tokens.

Model Details
ID
x-ai/grok-4.20
Provider
Kilo Gateway
Family
Release Date
Mar 31, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
KILO_API_KEY
API Base URL
https://api.kilo.ai/api/gateway
Documentation