Using Grok 4.20 Multi-Agent on Vercel AI Gateway

Implementation guide · Grok 4 · xAI

Serverless

Vercel AI Gateway exposes Grok 4.20 Multi-Agent through model ID xai/grok-4.20-multi-agent. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-07-10. Next refresh: weekly.

Quick Start

1
Create an account at Vercel AI Gateway and generate an API key.
2
Use the Vercel AI Gateway SDK or REST API to call xai/grok-4.20-multi-agent — see the documentation for request format.
3
You'll be billed $1.25/1M input, $2.50/1M output tokens. See full pricing.

API Portal Documentation Pricing Model Card

Code Examples

Install

pip install openai

API key

AI_GATEWAY_API_KEY

Model ID

xai/grok-4.20-multi-agent

creator/model-name e.g. kwaipilot/kat-coder-pro-v2

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["AI_GATEWAY_API_KEY"],
    base_url="https://ai-gateway.vercel.sh/v1"
)
response = client.chat.completions.create(
    model="xai/grok-4.20-multi-agent",
    messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)

Pricing on Vercel AI Gateway

Type	Price (per 1M)
Input tokens	$1.25
Output tokens	$2.50
Query	$5.00

Capabilities

VisionMultimodalReasoningJSON / Tool useStructured Outputs

About Grok 4.20 Multi-Agent

Grok 4.20 Multi-Agent is xAI's current API variant, served as grok-4.20-multi-agent-0309. Its reasoning.effort parameter controls collaborating-agent count. xAI's public pricing page lists a 1M-token context window.

Full model details →

Model Specs

Released2026-03-10

Context1m

Knowledge cutoff2024-11

Vercel