What is GPT-4 API?
Revolutionary AI model for unparalleled natural language interaction. API for ChatGPT 4.
Technical Specifications
- Supported inputs: Text
- Output: Text
- Context window: 8,000 tokens / Max output: —
- Endpoint: /chat/completions
Performance Benchmarks
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GPT-4 API Pricing
- Input: $39 / 1M tokens
- Output: $78 / 1M tokens
Where to Use GPT-4
Coding and code review
Generate, debug, and review code across languages, reading whole files or repos in a single prompt.
Agentic and multi-step workflows
Reliable tool-calling and instruction-following suit agent loops that plan, call tools, and iterate.
Long-document analysis
Summarize and extract from contracts, papers, and reports without aggressive chunking.
Code Sample
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Measured on the AI/ML API gateway across live traffic. Figures are medians unless stated. Last updated 2026-10-12.
GPT-4 is documented as suited to creative and technical writing tasks, including composing songs, writing screenplays, and learning a user’s writing style.
It is also documented as suitable for long-form content creation, extended conversations, and document search and analysis.
OpenAI also says it was used internally with impact on support, sales, content moderation, and programming.
Another documented use is building applications that draft documents, write code, answer questions about a knowledge base, analyze texts, provide a natural-language interface for software, tutor in subjects, translate languages, and simulate game characters.
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.
| Type | Price |
|---|---|
| Input | |
| Output | |
| Cached input |
| Benchmark | Score | What it measures | Source | Retrieved |
|---|---|---|---|---|
| Intelligence | 6.7 | Composite score across standardised reasoning, knowledge and problem-solving evaluations, measured independently by Artificial Analysis | Source | September 12, 2026 |
| Coding | 13.1 | Composite score across standardised coding evaluations, measured independently by Artificial Analysis | Source | September 12, 2026 |
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.
