Is Grok 4.1 Fast available on FastMetal?

Not at the moment. Grok 4.5, 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.

How does Grok 4.1 Fast rank?

#107 on the public arena's Japanese board (ELO 1,362). Ranks move as the leaderboard is updated.

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x-ai/grok-4-1-fast

Not Available

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. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)

11/19/2025

2,000,000 tokens

#77 Text (Creative Writing)

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

Frequently asked questions

Is Grok 4.1 Fast available on FastMetal?: Not at the moment. Grok 4.5, 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.
How does Grok 4.1 Fast rank?: #107 on the public arena's Japanese board (ELO 1,362). Ranks move as the leaderboard is updated.