# o1-pro

o1-pro is an AI model released by OpenAI on Mar 19 2025.

## Facts

| Field | Value |
| --- | --- |
| Model | o1-pro |
| Developer | OpenAI |
| Release date | Wednesday, Mar 19 2025 |
| Licensing | Proprietary |

## API pricing

All rates in USD per 1,000,000 tokens, pay-as-you-go.

| Tier | Input | Output |
| --- | --- | --- |
| All documented contexts | $150.00 | $600.00 |

Verified August 18, 2026 against the first-party source: https://developers.openai.com/api/docs/models/o1-pro

## Questions and answers

### When was o1-pro released?

o1-pro was released by OpenAI on Wednesday, Mar 19 2025.

### Who made o1-pro?

o1-pro was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.

### How much does o1-pro cost?

o1-pro costs $150.00 per million input tokens and $600.00 per million output tokens through the OpenAI API. Rates are pay-as-you-go API prices verified against OpenAI's published pricing on August 18, 2026.

### Is o1-pro open source?

No. o1-pro is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after o1-pro?

OpenAI's previous tracked release was GPT-4.5 on Feb 27 2025, 20 days earlier. It was followed by GPT-4.1 on Apr 14 2025.


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Canonical page: https://aireleasetracker.com/model/openai/o1-pro
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Benchmark scores are the figures published by the releasing lab at launch.