Grok 4.20 Reasoning (Vertex AI (OpenAI-compatible)) API
About
Build advanced reasoning agents with Grok 4.20 Reasoning (Vertex AI (OpenAI-compatible)), 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 (Vertex AI (OpenAI-compatible)) via the LLM Gateway API with up to 30K output tokens.
Capabilities
Input Modalities
textimage
Output Modalities
text
Reasoning
Yes
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 (Vertex AI (OpenAI-compatible)) by 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
vertex-openai/grok-4-20-reasoning
Provider
LLM GatewayFamily
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