LLM Reference
OpenAI API

Using o3 Mini on OpenAI API

Implementation guide · o3 · OpenAI

Serverless

OpenAI API exposes o3 Mini through model ID o3-mini. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-06-04. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at OpenAI API and generate an API key.
  2. 2
    Use the OpenAI API SDK or REST API to call o3-mini — see the documentation for request format.

Code Examples

Install
pip install openai
API key
OPENAI_API_KEY
Model ID
o3-mini

Use the model slug directly, e.g. "gpt-4o" or "gpt-4.1-mini".

import os
from openai import OpenAI

client = OpenAI()  # reads OPENAI_API_KEY from env
response = client.chat.completions.create(
    model="o3-mini",
    messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)

Pricing on OpenAI API

Capabilities

ReasoningJSON / Tool useStructured OutputsCode ExecutionPrompt Caching

About o3 Mini

OpenAI o3-mini - cost-optimized reasoning model. Compact variant of reasoning model family.

Model Specs

Released2025-01-31
Context200k
ArchitectureDecoder Only
Knowledge cutoff2025-04

Provider

OpenAI API
OpenAI API

OpenAI

San Francisco, California, United States