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Grok 4.1 Fast Reasoning

Tools
x-ai/grok-4.1-fast-reasoning

131K context · May 2026 · 2 upstreams

xAI's most cost-effective reasoning model, featuring strong tool-calling capabilities and efficient knowledge base synthesis.

Bring your own keyAnyRouter has no platform route for Grok 4.1 Fast Reasoning. Requests use your key and bill your provider account. AnyRouter adds no fee.
context
131K
input / 1M (list)
$0.20
output / 1M (list)
$0.50
routes
2
speed, 24h
—

Upstreams

2
  1. 1GoogleYour key · not addedyour planTPS —TTFT ——
  2. 2Vercel AI GatewayYour key · not addedyour planTPS —TTFT ——

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Details

Owner
XAI
Kind
Chat
Released
May 2026
Context
131K
Data policy
Provider retention
Endpoint
/api/v1/chat/completions

Quick start

curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "x-ai/grok-4.1-fast-reasoning",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'