Model Comparison

Claude 3 Sonnet vs o1-proWhich is better in 2026?

o1-pro significantly outperforms across most benchmarks.

Verdict: Claude 3 Sonnet vs o1-pro — which is better?

Claude 3 Sonnet (by Anthropic) and o1-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.

Claude 3 Sonnet outperforms in 0 benchmarks, while o1-pro is better at 1 benchmark (GPQA). o1-pro significantly outperforms across most benchmarks.

Choose Claude 3 Sonnet if…

  • you want predictable pricing at $3.00/M input and $15.00/M output

Choose o1-pro if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Dec 2024
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude 3 Sonnet outperforms in 0 benchmarks, while o1-pro is better at 1 benchmark (GPQA).

o1-pro significantly outperforms across most benchmarks.

Tue Jun 23 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Claude 3 Sonnet specifies input context (200,000 tokens). Only Claude 3 Sonnet specifies output context (200,000 tokens).

Anthropic
Claude 3 Sonnet
Input200,000 tokens
Output200,000 tokens
OpenAI
o1-pro
Input- tokens
Output- tokens
Tue Jun 23 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude 3 Sonnet and o1-pro support multimodal inputs.

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

Claude 3 Sonnet

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 3 Sonnet

Proprietary

Closed source

o1-pro

Proprietary

Closed source

Release Timeline

When each model was launched

Claude 3 Sonnet was released on 2024-02-29, while o1-pro was released on 2024-12-17.

o1-pro is 10 months newer than Claude 3 Sonnet.

Claude 3 Sonnet

Feb 29, 2024

2.3 years ago

o1-pro

Dec 17, 2024

1.5 years ago

9mo newer

Knowledge Cutoff

When training data ends

o1-pro has a documented knowledge cutoff of 2023-09-30, while Claude 3 Sonnet'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 3 Sonnet's cutoff date.

Claude 3 Sonnet

—

o1-pro

Sep 2023

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (200,000 tokens)
OpenAI
Higher GPQA score (79.0% vs 40.4%)

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude 3 Sonnet
OpenAI
o1-pro

FAQ

Common questions about Claude 3 Sonnet vs o1-pro.

Which is better, Claude 3 Sonnet or o1-pro?

o1-pro significantly outperforms across most benchmarks. Claude 3 Sonnet 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 3 Sonnet compare to o1-pro in benchmarks?

Claude 3 Sonnet scores ARC-C: 93.2%, GSM8k: 92.3%, HellaSwag: 89.0%, MGSM: 83.5%, BIG-Bench Hard: 82.9%. o1-pro scores AIME 2024: 86.0%, GPQA: 79.0%.

What are the context window sizes for Claude 3 Sonnet and o1-pro?

Claude 3 Sonnet 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 3 Sonnet and o1-pro?

Claude 3 Sonnet is developed by Anthropic and o1-pro is developed by OpenAI.

Related comparisons