Is Grok 4.3 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 4.3?

1,000,000 tokens, shared between the prompt and the response.

x-ai/grok-4-3

Not Available

Grok 4.3

Grok 4.3 is a reasoning model from xAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual...

4/30/2026

1,000,000 tokens

Specifications

Modalities

Input

text

image

file

Output

text

Supported Parameters

frequency_penalty

include_reasoning

logprobs

max_tokens

presence_penalty

reasoning

reasoning_effort

response_format

seed

stop

structured_outputs

temperature

tool_choice

tools

top_logprobs

top_p

Reasoning Configuration

Default: Thinking on (effort: low)
Selectable effort levels: high
medium
low
none
Turning thinking off: Possible (reasoning.enabled: false)

How to control thinking, and what it costs

Frequently asked questions

Is Grok 4.3 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 4.3?: 1,000,000 tokens, shared between the prompt and the response.

Models you can use on FastMetal