xAIText generationReleased April 30, 2026

Grok 4.3

Name: Grok 4.3
Brand: xAI
SKU: grok-4.3
Availability: InStock

Grok 4.3 costs $1.25 per 1M input tokens and $2.5 per 1M output tokens on LLM API, with a 1M-token context window.

Pricing

Lowest price among 2 providers, after discounts.

Grok 4.3 prices on LLM API
Input	$1.25	per 1M tokens
Output	$2.5	per 1M tokens
Cache read	$0.2	per 1M tokens

Providers

Prices after each provider’s discount; the lowest in bold.

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Providers of Grok 4.3 on LLM API

Azure	$1.25	$2.5	$0.2	1M	4K
xAI	$1.25	$2.5	$0.2	1M	4K

Features

ToolsYes
Parallel tool callsNo
Image inputYes
ReasoningYes
Levels: none, low, medium, high
Prompt cachingYes
Structured outputsYes
JSON modeYes
StreamingYes
Web searchNo

Call Grok 4.3

POST /v1/chat/completionsSet LLMAPI_KEY to your LLM API key.Chat Completions docs

import os

from openai import OpenAI

client = OpenAI(
    base_url="https://api.llmapi.ai/v1",
    api_key=os.environ["LLMAPI_KEY"],
)

response = client.chat.completions.create(
    model="grok-4.3",
    messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.llmapi.ai/v1",
  apiKey: process.env.LLMAPI_KEY,
});

const response = await client.chat.completions.create({
  model: "grok-4.3",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(response.choices[0].message.content);

curl https://api.llmapi.ai/v1/chat/completions \
  -H "Authorization: Bearer $LLMAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "grok-4.3",
    "messages": [{"role": "user", "content": "Hello"}]
  }'

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Prices synced November 3, 2026.