⌘K

Grok 4.3

vtrix-grok-4.3

xAI's latest intelligence model for complex reasoning, software engineering, and agentic tool use. It supports a 1M context window, text and image input, configurable reasoning effort, function calling, and structured outputs.

Authentication

authorization string required

All APIs require authentication via Bearer Token.

Get API Key:

Visit API Key Management Page to get your API Key

Usage:

Add to request header:

Authorization: Bearer YOUR_API_KEY

Parameters

model string required

Model ID to use for the request.

Value: vtrix-grok-4.3

messages array required

Array of message objects representing the conversation history.

role string required

Message role.

Options: user, assistant, system, developer

content string | array required

Text string or multimodal content array. Supports text and image input.

reasoning_effort string

Controls how much reasoning the model performs before answering.

Default: low

Options: none, low, medium, high

max_tokens integer

Maximum tokens to generate in the completion.

temperature number

Sampling temperature to use.

Default: 1.0

Range: 0.0 - 2.0

top_p number

Nucleus sampling parameter.

Default: 1.0

Range: 0.0 - 1.0

stream boolean

Whether to stream response incrementally.

Default: false

tools array

List of tools the model may call.

type string required

Tool type.

Options: function

function object required

Function tool definition.

response_format object

Format that the model must output. Used for structured outputs.

type string required

Output format type.

Options: text, json_object, json_schema