gpt-4o — Free AI Model & API

github-models/gpt-4o

chat

Get API key →

Context Window 128K

Max Output 16K

Rate Limit 10 RPM, 50 RPD

Cost $0.00 FREE

Free Period Since May 10, 2026

Credit Card Not required

Status Online

Overview

GPT-4o is OpenAI's flagship multimodal model, available for free via GitHub Models with no credit card — just a GitHub account. While it supports image inputs natively on OpenAI's own API, the GitHub Models free tier currently serves the text-only path with 128K context and 16K max output. Rate limits are 10 RPM and 50 requests per day, and per-request caps of 8K input / 4K output tokens apply, so it is best for prompt engineering, model evaluation, and personal projects. Fully OpenAI SDK-compatible — drop in the GitHub Models base URL and your GitHub token, and existing OpenAI SDK code works unchanged.

Model ID

gpt-4o

Base URL

https://models.inference.ai.azure.com

Specifications

Context: 128K · Output: 16K · Modality: text · OpenAI Compat: Yes

Quick Start

Integrate gpt-4o with 3 lines of code. See the config generator for Claude Code, Cursor, and more.

from openai import OpenAI

client = OpenAI(
 base_url="https://models.inference.ai.azure.com",
 api_key="YOUR_API_KEY"
)

response = client.chat.completions.create(
 model="gpt-4o",
 messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)

import OpenAI from "openai";

const openai = new OpenAI({
 baseURL: "https://models.inference.ai.azure.com",
 apiKey: "YOUR_API_KEY",
});

const completion = await openai.chat.completions.create({
 model: "gpt-4o",
 messages: [{ role: "user", content: "Hello!" }],
});

console.log(completion.choices[0].message.content);

curl https://models.inference.ai.azure.com/chat/completions \
 -H "Content-Type: application/json" \
 -H "Authorization: Bearer YOUR_API_KEY" \
 -d '{
 "model": "gpt-4o",
 "messages": [{"role": "user", "content": "Hello!"}]
 }'

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Rate Limits & Constraints

Rate Limit 10 RPM, 50 RPD

Context Window 128K

Max Output Tokens 16K

Cost Free — since May 10, 2026

Credit Card Not required

OpenAI Compatible Yes — drop-in replacement

GitHub Models Platform Limitations

Low per-request token limits (8K input / 4K output)
Rate limits tied to GitHub Copilot subscription tier
Not suitable for large-context or long-generation tasks

Features & Use Cases

Best For

Chat

Modality Support

text

GitHub Models Highlights

45+ models including GPT-4.1 and o3
Free for all GitHub accounts
Includes Llama 4, DeepSeek-R1, Mistral
Base URL: models.inference.ai.azure.com

Playground — Test gpt-4o

Test gpt-4o directly in your browser. Your API key is sent directly to GitHub Models — never stored.

Model: gpt-4o Get Key

🔒 Your key is never stored — sent directly to the model provider via our server proxy.

Ready to chat with gpt-4o.

Frequently Asked Questions

How do I get an API key for gpt-4o?

Sign up at GitHub Models to get your API key. No credit card is required — just an email sign-up. Once you have the key, use the code snippets in the Quick Start section above.

Is gpt-4o really free?

Yes. gpt-4o is available on GitHub Models's free tier and has been free since May 10, 2026. Rate limits apply: 10 RPM, 50 RPD. Always check the provider's terms for any changes to the free tier.

What are gpt-4o's rate limits?

10 RPM, 50 RPD Context window: 128K. Max output: 16K. No credit card required.

What are the best free alternatives to gpt-4o?

Popular free alternatives include inclusionAI: Ring-2.6-1T, Baidu Qianfan: CoBuddy (free), Owl Alpha. You can also browse all 147+ free models on our site.