Grok 4.5 API

xAI's large language model for text generation and advanced reasoning
Context
500K tokens
Input
$2.6 / 1M
Output
$7.8 / 1M
Released
Jul 8, 2026

How to use Grok 4.5 API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to x-ai/grok-4-5.

import requests

r = requests.post(
   "https://api.aimlapi.com/v1/chat/completions",
   headers={"Authorization": "Bearer " + AIMLAPI_KEY},
   json={
     "model": "x-ai/grok-4-5",
     "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-4-5",
   "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-4-5","messages":[{"role":"user","content":"Hello!"}]}'

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

Grok 4.5 API Pricing

TypePrice
Input
$2.6 / 1M tokens
Output
$7.8 / 1M tokens

Prompt caching drops cached input to $0.65 / 1M tokens. Free credits on signup.

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