OpenAI: o3

Name: o3 API
Brand: Openai

stable

o3 is available through Everstack's OpenAI-compatible gateway with routing, fallback, retries, and observability.

o3o-seriesreleased Apr 16, 2025

Provider Quick start

Context

200K

tokens

Max output

100K

tokens

Input

$2.00

per 1M

Output

$8.00

per 1M

Activity

Daily period usage

Aggregated managed Everstack traffic. Buckets below 5 tenants or 100 requests are withheld.

Providers

ProviderContextInput /MOutput /M

Pricing

Item	Price	Unit
Input	$2.00	per 1M tokens
Output	$8.00	per 1M tokens
Cache read	$0.50	per 1M tokens

Performance

Reliability

Compare

Compare usage and performance

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Capabilities

Modalities

Input

Output

Details

Model ID: o3
Family: o-series
Status: stable
Knowledge: -
Released: Apr 16, 2025

Gateway Config

API: 2024-01-01
Auth: OPENAI_API_KEY
Discovery: static
Provider type: static

Quick Start

index.ts

import Everstack from "@everstack/node";const client = new Everstack({  apiKey: process.env.EVERSTACK_API_KEY!,  baseUrl: "https://{instance}.{region}.everstack.ai",});const completion = await client.chat.completions.create({  model: "@openai/o3",  messages: [{ role: "user", content: "Explain vector cache routing." }],});console.log(completion.choices[0]?.message?.content);

Endpoint

Base URL

https://api.openai.com/v1

Chat completions

https://api.openai.com/v1/chat/completions

Model

o3

Auth env

OPENAI_API_KEY

o3 FAQ

How much does the o3 API cost?

Through OpenAI, o3 costs $2.00 per 1M input tokens and $8.00 per 1M output tokens.

What is the context window of o3?

o3 accepts up to 200K tokens of context and returns up to 100K output tokens on OpenAI.

Which providers offer o3?

o3 is available from Azure OpenAI and OpenAI. Everstack can route between them with automatic fallback when one is unavailable.

What can o3 do?

o3 supports chat, function calling, image input and reasoning. It accepts text, image and PDF input.

How do I call o3 through Everstack?

Point any OpenAI-compatible SDK at your Everstack gateway and set the model to @openai/o3. Everstack adds retries, provider fallback, caching, per-tenant budgets and OpenTelemetry traces for every request.