Grok 4.1 Fast Reasoning

xaixai/grok-4-1-fast-reasoning

xAI's latest fast reasoning model with 2M token context window. Combines speed with strong reasoning capabilities, supporting text and image inputs with function calling and structured outputs.

上下文长度

最大输出

66K

输入价格

$0.360每百万 Tokens

输出价格

$0.900每百万 Tokens

模态能力

文本图像→文本

价格明细

类型	费率
输入	$0.360 每百万 Tokens
输出	$0.900 每百万 Tokens

支持参数

temperaturemax_tokenstop_ptoolstool_choiceresponse_formatreasoningstop

API 使用示例

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-4-1-fast-reasoning",
    "messages": [
      {"role": "user", "content": "Summarize the key points from this input."}
    ]
  }'