Grok 4.20 (Reasoning) API
About
Build advanced reasoning agents with Grok 4.20 (Reasoning), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $1.25/1M input and $2.50/1M output tokens, native tool calling support. Access Grok 4.20 (Reasoning) via the DevPass (LLM Gateway) API with up to 30K output tokens.
Capabilities
Input Modalities
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Output Modalities
text
Limits
Context Window
2.0M
Tokens
Input Limit
2.0M
Tokens
Max Output
30K
Tokens
Pricing
Standard (per 1M tokens)
Input
$1.25
Output
$2.50
Caching (per 1M tokens)
Read
$0.20
Frequently Asked Questions
Grok 4.20 (Reasoning) by DevPass (LLM Gateway) costs $1.25 per 1M input tokens and $2.50 per 1M output tokens. Cached reads cost $0.20 per 1M tokens.
Model Details
ID
grok-4-20-reasoning
Provider
DevPass (LLM Gateway)Family
grok
Release Date
Mar 9, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
LLMGATEWAY_API_KEY
API Base URL
https://api.llmgateway.io/v1