Grok 4 Fast Reasoning API Pricing

Grok 4 Fast Reasoning 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 Fast Reasoning costs in practice

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

Use Grok 4 Fast Reasoning with LiteLLM

Call Grok 4 Fast Reasoning 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="azure_ai/grok-4-fast-reasoning",
    messages=[{"role": "user", "content": "Hello!"}],
)

model_list:
  - model_name: grok-4-fast-reasoning
    litellm_params:
      model: azure_ai/grok-4-fast-reasoning
      # 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-fast-reasoning",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Grok 4 Fast Reasoning 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