Is Grok 4 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?

256,000 tokens, shared between the prompt and the response.

How does Grok 4 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

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Grok 4

Grok 4 is xAI's latest reasoning model with a 256k context window. It supports parallel tool calling, structured outputs, and both image and text inputs. Note that reasoning is not exposed, reasoning cannot be disabled, and the reasoning effort cannot be specified. Pricing increases once the total tokens in a given request is greater than 128k tokens. See more details on the [xAI docs](https://docs.x.ai/docs/models/grok-4-0709)

7/9/2025

256,000 tokens

#24 Text (Math)

Specifications

Modalities

Input

image

text

Output

text

Supported Parameters

include_reasoning

logprobs

max_tokens

reasoning

response_format

seed

structured_outputs

temperature

tool_choice

tools

top_logprobs

top_p

Frequently asked questions

Is Grok 4 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?: 256,000 tokens, shared between the prompt and the response.
How does Grok 4 rank?: #107 on the public arena's Japanese board (ELO 1,362). Ranks move as the leaderboard is updated.