Model Comparison

Grok-1.5V vs o3Which is better in 2026?

o3 significantly outperforms across most benchmarks.

Verdict: Grok-1.5V vs o3 — which is better?

Grok-1.5V (by xAI) and o3 (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-1.5V outperforms in 0 benchmarks, while o3 is better at 2 benchmarks (MathVista, MMMU). o3 significantly outperforms across most benchmarks.

Choose Grok-1.5V if…

  • you are already invested in the xAI ecosystem

Choose o3 if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you want the most recent training data — it shipped Apr 2025
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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Grok-1.5V outperforms in 0 benchmarks, while o3 is better at 2 benchmarks (MathVista, MMMU).

o3 significantly outperforms across most benchmarks.

Wed Jun 24 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

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

xAI
Grok-1.5V
Input- tokens
Output- tokens
OpenAI
o3
Input200,000 tokens
Output100,000 tokens
Wed Jun 24 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok-1.5V and o3 support multimodal inputs.

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

Grok-1.5V

Text
Images
Audio
Video

o3

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-1.5V

Proprietary

Closed source

o3

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-1.5V was released on 2024-04-12, while o3 was released on 2025-04-16.

o3 is 12 months newer than Grok-1.5V.

Grok-1.5V

Apr 12, 2024

2.2 years ago

o3

Apr 16, 2025

1.2 years ago

1.0yr newer

Knowledge Cutoff

When training data ends

o3 has a documented knowledge cutoff of 2024-05-31, while Grok-1.5V's cutoff date is not specified.

We can confirm o3's training data extends to 2024-05-31, but cannot make a direct comparison without Grok-1.5V's cutoff date.

Grok-1.5V

—

o3

May 2024

Outputs Comparison

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Key Takeaways

xAI

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

OpenAI
Larger context window (200,000 tokens)
Higher MathVista score (86.8% vs 52.8%)
Higher MMMU score (82.9% vs 53.6%)
xAIGrok-1.5V
OpenAIo3
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Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-1.5V
OpenAI
o3

FAQ

Common questions about Grok-1.5V vs o3.

Which is better, Grok-1.5V or o3?

o3 significantly outperforms across most benchmarks. Grok-1.5V is made by xAI and o3 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok-1.5V compare to o3 in benchmarks?

Grok-1.5V scores AI2D: 88.3%, DocVQA: 85.6%, TextVQA: 78.1%, ChartQA: 76.1%, RealWorldQA: 68.7%. o3 scores COLLIE: 98.4%, AIME 2024: 91.6%, ARC-AGI: 88.0%, MathVista: 86.8%, AIME 2025: 86.4%.

What are the context window sizes for Grok-1.5V and o3?

Grok-1.5V supports an unknown number of tokens and o3 supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Grok-1.5V and o3?

Grok-1.5V is developed by xAI and o3 is developed by OpenAI.

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