Model Comparison

Claude Opus 4 vs o1-pro

Claude Opus 4 significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Opus 4 outperforms in 1 benchmarks (GPQA), while o1-pro is better at 0 benchmarks.

Claude Opus 4 significantly outperforms across most benchmarks.

Sun May 24 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Claude Opus 4 specifies input context (200,000 tokens). Only Claude Opus 4 specifies output context (32,000 tokens).

Anthropic
Claude Opus 4
Input200,000 tokens
Output32,000 tokens
OpenAI
o1-pro
Input- tokens
Output- tokens
Sun May 24 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4 and o1-pro support multimodal inputs.

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

Claude Opus 4

Text
Images
Audio
Video

o1-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.

Claude Opus 4

Proprietary

Closed source

o1-pro

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4 was released on 2025-05-22, while o1-pro was released on 2024-12-17.

Claude Opus 4 is 5 months newer than o1-pro.

Claude Opus 4

May 22, 2025

1.0 years ago

5mo newer
o1-pro

Dec 17, 2024

1.4 years ago

Knowledge Cutoff

When training data ends

o1-pro has a documented knowledge cutoff of 2023-09-30, while Claude Opus 4's cutoff date is not specified.

We can confirm o1-pro's training data extends to 2023-09-30, but cannot make a direct comparison without Claude Opus 4's cutoff date.

Claude Opus 4

—

o1-pro

Sep 2023

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Higher GPQA score (79.6% vs 79.0%)
OpenAI

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

AnthropicClaude Opus 4
OpenAIo1-pro
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Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4
OpenAI
o1-pro

FAQ

Common questions about Claude Opus 4 vs o1-pro.

Which is better, Claude Opus 4 or o1-pro?

Claude Opus 4 significantly outperforms across most benchmarks. Claude Opus 4 is made by Anthropic and o1-pro is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4 compare to o1-pro in benchmarks?

Claude Opus 4 scores MMMLU: 88.8%, TAU-bench Retail: 81.4%, GPQA: 79.6%, MMMU (validation): 76.5%, AIME 2025: 75.5%. o1-pro scores AIME 2024: 86.0%, GPQA: 79.0%.

What are the context window sizes for Claude Opus 4 and o1-pro?

Claude Opus 4 supports 200K tokens and o1-pro supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Claude Opus 4 and o1-pro?

Claude Opus 4 is developed by Anthropic and o1-pro is developed by OpenAI.