Is Grok 4.1 Fast available on FastMetal?

Not at the moment. Grok 4.6, from the same lab, is available on the FastMetal API today.

What is the context window of Grok 4.1 Fast?

2,000,000 tokens, shared between the prompt and the response.

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xAI

x-ai/grok-4-1-fast

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Grok 4.1 Fast

Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window. Reasoning can be enabled/disabled using the `reasoning` `enabled` parameter in the API.

11/19/2025

2,000,000 tokens

Specifications

Modalities

Input

text

image

Output

text

Supported Parameters

include_reasoning

logprobs

max_tokens

reasoning

response_format

seed

structured_outputs

temperature

tool_choice

tools

top_logprobs

top_p

Max Output Tokens

30,000

Data policy

Prompt retention: Unknown — we could not confirm
Training: Unknown — not declared

"Unknown" does not mean "safe". It means we could not confirm it.

Whether a provider trains on prompts is a declared value from our terms with them. Retention is determined from the upstream listing for every host this model can reach. Neither is guessed.

Frequently asked questions

Is Grok 4.1 Fast available on FastMetal?: Not at the moment. Grok 4.6, from the same lab, is available on the FastMetal API today.
What is the context window of Grok 4.1 Fast?: 2,000,000 tokens, shared between the prompt and the response.

Models you can use on FastMetal