GPT-4 API

openai/gpt-4
Revolutionary AI model for unparalleled natural language interaction.
Context
8K tokens
Input
$39 / 1M tokens
Output
$78 / 1M tokens
Released
Aug 7, 2025

How to use GPT-4 API

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

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

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

GPT-4 API Pricing

TypePrice
Input
$39 / 1M tokens
Output
$78 / 1M tokens
Cached input
$39 / 1M tokens

GPT-4 Benchmarks

BenchmarkScoreWhat it measuresSourceRetrieved
Intelligence
6.7
Composite score across standardised reasoning, knowledge and problem-solving evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026
Coding
13.1
Composite score across standardised coding evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026

Frequently asked questions

GPT-4 has a 8,000 tokens context window.

GPT-4 takes text as input and returns text.

Use openai/gpt-4 as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.

GPT-4 became available on August 7, 2025.

GPT-4 is priced at input $39 / 1M tokens, output $78 / 1M tokens, cached input $39 / 1M tokens.

Yes, GPT-4 can stream responses as they are generated.

GPT-4 was built by OpenAI.

GPT-4 is described by OpenAI as the API version of ChatGPT 4.

Yes, GPT-4 supports function calling, tool use, and parallel tool calls.

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