LiteLLMModels

Grok 4.20 Beta Reasoning API Pricing

As of October 10, 2026, Grok 4.20 Beta Reasoning costs $1.25 per 1M input tokens and $2.50 per 1M output tokens on xAI, with cache reads at $0.20 per 1M tokens. It has a 1,000,000-token context window and returns up to 1,000,000 tokens per response.

By xAIModel ID xai/grok-4.20-beta-reasoningPrices updated Checked
Input
$1.25 / 1M tokens
Output
$2.50 / 1M tokens
Cache read
$0.20 / 1M tokens
Context window
1,000,000 tokens
Max output
1,000,000 tokens
Providers
1
Added to LiteLLM
September 22, 2026

Grok 4.20 Beta 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.

ProviderModel name in LiteLLMInputOutputCache readContext
xAIxai/grok-4.20-beta-reasoning$1.25$2.50$0.201M

Other Grok 4.20 Beta Reasoning prices on xAI

Input above 200K tokens$2.50 per 1M tokens
Output above 200K tokens$5.00 per 1M tokens
Cache read above 200K tokens$0.40 per 1M tokens

What Grok 4.20 Beta Reasoning costs in practice

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

xAI$3.75

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

xAI$13.00

Grok 4.20 Beta Reasoning features

Use Grok 4.20 Beta Reasoning with LiteLLM

Call Grok 4.20 Beta 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.

Python SDK
from litellm import completion

response = completion(
    model="xai/grok-4.20-beta-reasoning",
    messages=[{"role": "user", "content": "Hello!"}],
)
Proxy config.yaml
model_list:
  - model_name: grok-4.20-beta-reasoning
    litellm_params:
      model: xai/grok-4.20-beta-reasoning
      api_key: os.environ/XAI_API_KEY
Call the proxy
curl http://0.0.0.0:4000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-1234" \
  -d '{
    "model": "grok-4.20-beta-reasoning",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Grok 4.20 Beta Reasoning FAQ

How much does Grok 4.20 Beta Reasoning cost?

Grok 4.20 Beta Reasoning costs $1.25 per 1M input tokens and $2.50 per 1M output tokens on xAI, with cache reads at $0.20 per 1M tokens. Above 200K input tokens, input costs $2.50 and output costs $5.00 per 1M tokens.

What is the context window of Grok 4.20 Beta Reasoning?

Grok 4.20 Beta Reasoning has a 1,000,000-token context window and returns up to 1,000,000 tokens per response.

Which providers offer Grok 4.20 Beta Reasoning?

Grok 4.20 Beta Reasoning is available from xAI through LiteLLM, using the model name xai/grok-4.20-beta-reasoning.

How do I call Grok 4.20 Beta Reasoning with an OpenAI-compatible API?

Use the LiteLLM Python SDK with model="xai/grok-4.20-beta-reasoning", or add the model to the LiteLLM proxy's config.yaml and send requests to /v1/chat/completions from any OpenAI client. LiteLLM tracks the cost of every request at the prices on this page.

What features does Grok 4.20 Beta Reasoning support?

Grok 4.20 Beta Reasoning supports function calling, structured output, image input, reasoning, prompt caching and web search.

When did LiteLLM add Grok 4.20 Beta Reasoning?

Grok 4.20 Beta Reasoning was added to LiteLLM's model price file on September 22, 2026.

Sources

Prices come from LiteLLM's open-source model_prices_and_context_window.json, which LiteLLM uses to calculate the cost of every request. Provider pricing pages:

LiteLLM docs: xAI.

Provider pages: xAI.