TheRouter.aiTheRouter.ai
Back to Models

Grok 4.20 Reasoning

xaixai/grok-4.20-reasoning

xAI's flagship model (March 2026) with 2M token context window and deep reasoning. Best for complex multi-step tasks, analysis, and research with function calling and structured outputs.

Context Length
2M
Max Output
66K
Input Priceper 1M tokens
$3.60/ 1M tokens
Output Priceper 1M tokens
$10.80/ 1M tokens

Modalities

textimage→text

Pricing Breakdown

TypeRate
Input$3.60 / 1M tokens
Output$10.80 / 1M tokens

Supported Parameters

temperaturemax_tokenstop_ptoolstool_choiceresponse_formatreasoningstop

API Usage Examples

Use the global api.therouter.ai endpoint shown below for new integrations; the legacy China accelerated endpoint is retired.

cURL
curl https://api.therouter.ai/v1/chat/completions   -H "Content-Type: application/json"   -H "Authorization: Bearer $THE_ROUTER_API_KEY"   -d '{
    "model": "xai/grok-4.20-reasoning",
    "messages": [
      {"role": "user", "content": "Summarize the key points from this input."}
    ]
  }'
Customer Support