Grok 4.20 Multi-Agent - Unifically

Grok 4.20 Multi-Agent runs a leader agent plus 4 or 16 xAI sub-agents in parallel for research tasks, with a 1M context window and image input. Set reasoning.effort to low or medium for 4 agents, high or xhigh for 16.

Model

xai/grok-4.20-multi-agent-0309


Provider	xAI
Name	Grok 4.20 Multi-Agent

Supported Endpoints

xAI serves this model on the Responses API only. POST /v1/chat/completions and POST /v1/messages return an upstream error for it.

Responses — POST /v1/responses

Example

curl -X POST https://api.unifically.com/v1/responses \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "xai/grok-4.20-multi-agent-0309",
    "reasoning": {"effort": "high"},
    "input": "Compare the three leading approaches to on-device speech recognition and recommend one for a battery-constrained wearable."
  }'

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