# Grok 4.20 Multi-Agent (Beta) (xAI) — API pricing and providers

> Multi-agent research. Model id `xai/grok-4.20-multi-agent-0309`. Text model by xAI.

- Page: https://infro.io/models/xai/grok-4.20-multi-agent-0309
- Vendor: xAI (https://infro.io/models/xai)
- Modality: Text
- Endpoint through INFRO: `POST /v1/chat/completions` at https://api.infro.io/v1
- List rate: $1.25 per 1M input tokens and $2.50 per 1M output tokens, with cached input at $0.20 per 1M tokens
- Rates checked: 2026-10-05

Rates are xAI's published list price: what the customer's own provider account bills, not an INFRO charge. INFRO is a BYOK control plane; it charges a software subscription and adds 0% to model spend.

## Providers that serve it

| Provider | Model id sent |
| --- | --- |
| xAI | `grok-4.20-multi-agent-0309` |
| OpenRouter | `xai/grok-4.20-multi-agent-0309` |

## Questions

### How much does the Grok 4.20 Multi-Agent (Beta) API cost?

xAI's published list rate for Grok 4.20 Multi-Agent (Beta) is $1.25 per 1M input tokens and $2.50 per 1M output tokens, with cached input at $0.20 per 1M tokens (checked 2026-10-05). The provider account you connect bills you at the rate on that account, so a negotiated rate replaces the list rate. INFRO adds 0% to model spend.

### Which providers serve Grok 4.20 Multi-Agent (Beta)?

In INFRO's provider registry, Grok 4.20 Multi-Agent (Beta) can be served by xAI and OpenRouter. You connect your own account with any of them, and INFRO routes and fails over between the ones you connect.

### What is the Grok 4.20 Multi-Agent (Beta) model ID?

Request it from INFRO as "xai/grok-4.20-multi-agent-0309". INFRO sends each provider its own id: xAI "grok-4.20-multi-agent-0309", OpenRouter "xai/grok-4.20-multi-agent-0309".

### How do I call Grok 4.20 Multi-Agent (Beta) through an OpenAI-compatible API?

Point an OpenAI SDK, or any HTTP client, at https://api.infro.io/v1 with an INFRO gateway key and send model "xai/grok-4.20-multi-agent-0309" to POST /v1/chat/completions. INFRO runs the request on a provider account you connected and returns the provider's response with an estimated cost.

### Does INFRO mark up Grok 4.20 Multi-Agent (Beta) usage?

No. xAI or the provider you connect bills model usage to your own account. INFRO charges a software subscription for routing, failover, observability, budgets and policy, and takes 0% of model spend.