Grok 4.1 Fast API Pricing

Grok 4.1 Fast pricing by provider

1 listing across 1 provider. Token prices are in US dollars per 1M tokens. The highlighted row is the price quoted above.

What Grok 4.1 Fast costs in practice

1,000 requests with 2,000 input and 500 output tokens each

100 long-document requests with 100,000 input and 2,000 output tokens each

Grok 4.1 Fast features

• Function calling
• Structured output

Use Grok 4.1 Fast with LiteLLM

Call Grok 4.1 Fast through the LiteLLM Python SDK, or put it behind the LiteLLM proxy and send OpenAI-format requests to /v1/chat/completions. LiteLLM tracks the cost of every request at these prices.

from litellm import completion

response = completion(
    model="oci/xai.grok-4.1-fast",
    messages=[{"role": "user", "content": "Hello!"}],
)

model_list:
  - model_name: grok-4.1-fast
    litellm_params:
      model: oci/xai.grok-4.1-fast
      # credentials: see the provider's LiteLLM docs page

curl http://0.0.0.0:4000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-1234" \
  -d '{
    "model": "grok-4.1-fast",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Grok 4.1 Fast FAQ

More xAI models

• Grok 4.20 Beta$1.25 / $2.50 per 1M tokens
• Grok 4.20 Beta Latest Non Reasoning$1.25 / $2.50 per 1M tokens
• Grok 4.20 Beta Latest Reasoning$1.25 / $2.50 per 1M tokens
• Grok 4.20 Beta Non Reasoning$1.25 / $2.50 per 1M tokens
• Grok 4.20 Beta Reasoning$1.25 / $2.50 per 1M tokens
• Grok 4.20 Experimental Beta$1.25 / $2.50 per 1M tokens
• Grok 4.20 Experimental Beta 0304 Non Reasoning$1.25 / $2.50 per 1M tokens
• Grok 4.20 Experimental Beta 0304 Reasoning$1.25 / $2.50 per 1M tokens