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OpenAI

o3 Pro

openai/o3-pro

The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning.

$22.00 in · $88.00 out per 1M tokens200k contextJun 10, 2025

about 5.5¢ a message

A typical message: about 500 tokens you send and 500 it writes.

Chat with o3 Pro
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Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens
$22.00provider $20.00
Output, per 1M tokens
$88.00provider $80.00
Margin
+10%

Context and formats

Context window
200,000 tokens
Longest answer
100,000 tokens
Reads
text, images, and files
Makes
text
First listed
2025-06-10

Measured here, last 7 days

First token, median
not measured
Answered without error
not measured

Tools and JSON

Tool calling
declaredthe provider's claim, not yet measured here
JSON output
declaredthe provider's claim, not yet measured here

Price and latency history as JSON: GET /api/planet/history?id=openai/o3-pro.

About

The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning. The o3-pro model uses more compute to think harder and provide consistently...

In OpenAI's words.

Try it here

The answer appears here.

Measured here

Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

curl https://useantimatter.com/v1/chat/completions \
  -H "Authorization: Bearer $ANTIMATTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "openai/o3-pro", "messages": [{"role": "user", "content": "Hello"}]}'

Everything else is in the docs.

Embed this

A badge showing this model's live price per million tokens, as billed here, for a README or a site. It links back to this page.

o3 Pro price on Antimatter
<a href="https://useantimatter.com/planet/openai/o3-pro"><img src="https://useantimatter.com/api/badge/price?id=openai%2Fo3-pro" alt="o3 Pro price on Antimatter" height="28"></a>

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