o3 Pro
OpenAI o3 Pro — pricing, 200k context window, API cost calculator and alternatives.
By OpenAI
Specs
- Provider
- OpenAI
- Slug
- openai/o3-pro
- Capabilities
- vision, tools, json_mode
Pricing freshness
- Tier
- standard
- Currency
- USD
- As of
- 2026-05-08 17:08 UTC
Pricing history
Tracking o3 Pro pricing since 2026-05-08. We'll plot the chart here once it changes.
Quickstart — call o3 Pro from your app
curl https://api.openai.com/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $OPENAI_API_KEY" \
-d '{
"model": "o3-pro",
"messages": [{"role": "user", "content": "Hello!"}]
}'Official docs: https://platform.openai.com/docs/api-reference/chat
# pip install openai
from openai import OpenAI
client = OpenAI(
base_url="https://api.openai.com/v1",
api_key=os.environ["OPENAI_API_KEY"],
)
resp = client.chat.completions.create(
model="o3-pro",
messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)Official docs: https://platform.openai.com/docs/api-reference/chat
// npm install openai
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.openai.com/v1",
apiKey: process.env.OPENAI_API_KEY,
});
const resp = await client.chat.completions.create({
model: "o3-pro",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(resp.choices[0].message.content);Official docs: https://platform.openai.com/docs/api-reference/chat
Related models
Similar capabilities, context window, and price tier — drawn from across the catalog so you can compare alternatives in one click.
Frequently asked questions
What is o3 Pro?
o3 Pro is a large language model API from OpenAI with a 200k-token context window. It costs $20 per 1M input tokens and $80 per 1M output tokens.
How much does o3 Pro cost?
o3 Pro is priced at $20 per 1M input tokens and $80 per 1M output tokens via the OpenAI API. A 50/50 input/output workload of 1M total tokens costs about $50.
What is the context window of o3 Pro?
o3 Pro supports up to 200k tokens of context per request — roughly 400 pages of English text or 25000 lines of code at a typical density.
Does o3 Pro support vision, tool use, or JSON mode?
o3 Pro supports vision, tool/function calling, and structured JSON mode.
Who makes o3 Pro?
o3 Pro is built and operated by OpenAI. Pricing, context window, and capabilities on this page are refreshed nightly from OpenAI's public catalog.
Can I self-host o3 Pro?
o3 Pro is API-only — its weights are not publicly distributed by OpenAI, so it cannot be self-hosted today.