Model Comparison

o1-pro vs o3-proWhich is better in 2026?

Comparing o1-pro and o3-pro across benchmarks, pricing, and capabilities.

Verdict: o1-pro vs o3-pro — which is better?

o1-pro (by OpenAI) and o3-pro (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Choose o1-pro if…

  • you are already invested in the OpenAI ecosystem

Choose o3-pro if…

  • you want the most recent training data — it shipped Jun 2025

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

o1-pro and o3-prodon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only o3-pro specifies input context (200,000 tokens). Only o3-pro specifies output context (100,000 tokens).

OpenAI
o1-pro
Input- tokens
Output- tokens
OpenAI
o3-pro
Input200,000 tokens
Output100,000 tokens
Wed Jul 22 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both o1-pro and o3-pro support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

o1-pro

Text
Images
Audio
Video

o3-pro

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

o1-pro

Proprietary

Closed source

o3-pro

Proprietary

Closed source

Release Timeline

When each model was launched

o1-pro was released on 2024-12-17, while o3-pro was released on 2025-06-10.

o3-pro is 6 months newer than o1-pro.

o1-pro

Dec 17, 2024

1.6 years ago

o3-pro

Jun 10, 2025

1.1 years ago

5mo newer

Knowledge Cutoff

When training data ends

o1-pro has a knowledge cutoff of 2023-09-30, while o3-pro has a cutoff of 2024-05-31.

o3-pro has more recent training data (up to 2024-05-31), making it potentially better informed about events through that date compared to o1-pro (2023-09-30).

o1-pro

Sep 2023

o3-pro

May 2024

8 mo newer

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI

No standout differentiators in the data we have for this pair.

OpenAI
Larger context window (200,000 tokens)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against o1-pro and o3-pro side-by-side, then vote on the output you prefer.

o1-pro
✓ Preferred
o3-pro
Open in Playground
AI Model Comparison Table
Feature
OpenAI
o1-pro
OpenAI
o3-pro

FAQ

Common questions about o1-pro vs o3-pro.

Which is better, o1-pro or o3-pro?

o1-pro (OpenAI) and o3-pro (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does o1-pro compare to o3-pro in benchmarks?

o1-pro scores AIME 2024: 86.0%, GPQA: 79.0%.

What are the context window sizes for o1-pro and o3-pro?

o1-pro supports an unknown number of tokens and o3-pro supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

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