Grok 4.3 API

Grok 4.3 is a large language model by xAI for text generation and reasoning tasks. Supports up to 1M context tokens and is optimized for conversational AI and analytical workflows.
Context
1M tokens
Input
$1.625 / 1M
Output
$3.25 / 1M

How to use Grok 4.3 API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to x-ai/grok-4-3.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "x-ai/grok-4-3",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ]
    },
)
print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "x-ai/grok-4-3",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }),
});
console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"x-ai/grok-4-3","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

Grok 4.3 API Pricing

TypePrice
Input
$1.625 / 1M tokens
Output
$3.25 / 1M tokens

Grok 4.3 Benchmarks

BenchmarkScoreWhat it measures
Humanity's Last Exam
35%
Expert-level questions across many domains
GPQA Diamond
90.1%
Google-proof graduate science questions (hardest subset)

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