Question 1

How much does Grok 4.1 Fast Reasoning cost?

Accepted Answer

Grok 4.1 Fast Reasoning costs $0.2 per 1 million input tokens and $0.5 per 1 million output tokens. This pricing is set by xAI.

Question 2

What tokenizer does Grok 4.1 Fast Reasoning use?

Accepted Answer

Grok 4.1 Fast Reasoning uses the cl100k_base tokenizer. This tokenizer has a vocabulary of ~100,000 tokens and is widely used across many models.

Question 3

What is Grok 4.1 Fast Reasoning's context window?

Accepted Answer

Grok 4.1 Fast Reasoning supports a context window of 2.0M tokens (2,000,000 tokens). The maximum output length is 16K tokens.

Question 4

How does Grok 4.1 Fast Reasoning compare to other models?

Accepted Answer

You can compare Grok 4.1 Fast Reasoning's pricing and capabilities against other LLMs in the comparison table above, or visit the full pricing page for a side-by-side view of all models.

Question 5

How do I count tokens for Grok 4.1 Fast Reasoning?

Accepted Answer

Use the token counter at the top of this page or visit the homepage calculator. Paste your text and it will show the exact token count and cost for Grok 4.1 Fast Reasoning using the cl100k_base tokenizer.

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