Using Grok 4.20 Multi-Agent on OpenRouter

Quick Start

1. 1
   Create an account at OpenRouter and generate an API key.
2. 2
   Use the OpenRouter SDK or REST API to call x-ai/grok-4.20-multi-agent — see the documentation for request format.
3. 3
   You'll be billed $2.00/1M input, $6.00/1M output tokens. See full pricing.

Code Examples

About OpenRouter

OpenRouter provides a unified interface for Large Language Models with better pricing, improved uptime, and no subscription requirements. Route across providers for cost optimization and reliability.

OpenRouter is a multi-provider LLM aggregator offering unified API access to 300+ models from all major labs and emerging providers, with automatic failover for reliability.

Pricing on OpenRouter

Capabilities

About Grok 4.20 Multi-Agent

Grok 4.20 Multi-Agent is the extended-context xAI API variant launched around March 10, 2026 as grok-4.20-multi-agent-0309. Its reasoning.effort parameter controls how many collaborating agents are used, and the variant carries a 2M token context window.