Model Comparison

Grok 4.5 vs o1-proWhich is better in 2026?

Grok 4.5 significantly outperforms across most benchmarks.

Verdict: Grok 4.5 vs o1-pro — which is better?

Grok 4.5 (by xAI) 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.

Grok 4.5 outperforms in 1 benchmarks (GPQA), while o1-pro is better at 0 benchmarks. Grok 4.5 significantly outperforms across most benchmarks.

Choose Grok 4.5 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Choose o1-pro if…

  • you are already invested in the OpenAI ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Grok 4.5 outperforms in 1 benchmarks (GPQA), while o1-pro is better at 0 benchmarks.

Grok 4.5 significantly outperforms across most benchmarks.

Sun Jul 19 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Grok 4.5 specifies input context (500,000 tokens).

xAI
Grok 4.5
Input500,000 tokens
Output- tokens
OpenAI
o1-pro
Input- tokens
Output- tokens
Sun Jul 19 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok 4.5 and o1-pro support multimodal inputs.

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

Grok 4.5

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.

Grok 4.5

Proprietary

Closed source

o1-pro

Proprietary

Closed source

Release Timeline

When each model was launched

Grok 4.5 was released on 2026-07-16, while o1-pro was released on 2024-12-17.

Grok 4.5 is 19 months newer than o1-pro.

Grok 4.5

Jul 16, 2026

2 days ago

1.6yr newer
o1-pro

Dec 17, 2024

1.6 years ago

Knowledge Cutoff

When training data ends

Grok 4.5 has a knowledge cutoff of 2026-02-01, while o1-pro has a cutoff of 2023-09-30.

Grok 4.5 has more recent training data (up to 2026-02-01), making it potentially better informed about events through that date compared to o1-pro (2023-09-30).

Grok 4.5

Feb 2026

2.4 yr newer
o1-pro

Sep 2023

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

xAI
Larger context window (500,000 tokens)
Higher GPQA score (93.0% vs 79.0%)
OpenAI

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

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Grok 4.5 and o1-pro side-by-side, then vote on the output you prefer.

Grok 4.5
✓ Preferred
o1-pro
Open in Playground
AI Model Comparison Table
Feature
xAI
Grok 4.5
OpenAI
o1-pro

FAQ

Common questions about Grok 4.5 vs o1-pro.

Which is better, Grok 4.5 or o1-pro?

Grok 4.5 significantly outperforms across most benchmarks. Grok 4.5 is made by xAI 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 Grok 4.5 compare to o1-pro in benchmarks?

Grok 4.5 scores GPQA: 93.0%, Terminal-Bench 2.1: 83.3%, Artificial Analysis Coding Agent Index v1.1: 76.0%, SWE-Bench Pro: 64.7%, AA-Omniscience Index: 63.0%. o1-pro scores AIME 2024: 86.0%, GPQA: 79.0%.

What are the context window sizes for Grok 4.5 and o1-pro?

Grok 4.5 supports 500K 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 Grok 4.5 and o1-pro?

Grok 4.5 is developed by xAI and o1-pro is developed by OpenAI.

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