Model Comparison

GPT-4 vs Grok-4 HeavyWhich is better in 2026?

Grok-4 Heavy significantly outperforms across most benchmarks.

Verdict: GPT-4 vs Grok-4 Heavy — which is better?

GPT-4 (by OpenAI) and Grok-4 Heavy (by xAI) 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.

GPT-4 outperforms in 0 benchmarks, while Grok-4 Heavy is better at 1 benchmark (GPQA). Grok-4 Heavy significantly outperforms across most benchmarks.

Choose GPT-4 if…

  • you want predictable pricing at $30.00/M input and $60.00/M output

Choose Grok-4 Heavy if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-4 outperforms in 0 benchmarks, while Grok-4 Heavy is better at 1 benchmark (GPQA).

Grok-4 Heavy significantly outperforms across most benchmarks.

Sun Jun 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-4 specifies input context (32,768 tokens). Only GPT-4 specifies output context (32,768 tokens).

OpenAI
GPT-4
Input32,768 tokens
Output32,768 tokens
xAI
Grok-4 Heavy
Input- tokens
Output- tokens
Sun Jun 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-4 and Grok-4 Heavy support multimodal inputs.

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

GPT-4

Text
Images
Audio
Video

Grok-4 Heavy

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.

GPT-4

Proprietary

Closed source

Grok-4 Heavy

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-4 was released on 2023-06-13, while Grok-4 Heavy's release date is not specified.

We can confirm GPT-4's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

GPT-4

Jun 13, 2023

3.0 years ago

Grok-4 Heavy

—

Knowledge Cutoff

When training data ends

GPT-4 has a knowledge cutoff of 2022-12-31, while Grok-4 Heavy has a cutoff of 2024-12-31.

Grok-4 Heavy has more recent training data (up to 2024-12-31), making it potentially better informed about events through that date compared to GPT-4 (2022-12-31).

GPT-4

Dec 2022

Grok-4 Heavy

Dec 2024

2 yr newer

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (32,768 tokens)
xAI
Higher GPQA score (88.4% vs 35.7%)

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-4
xAI
Grok-4 Heavy

FAQ

Common questions about GPT-4 vs Grok-4 Heavy.

Which is better, GPT-4 or Grok-4 Heavy?

Grok-4 Heavy significantly outperforms across most benchmarks. GPT-4 is made by OpenAI and Grok-4 Heavy is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-4 compare to Grok-4 Heavy in benchmarks?

GPT-4 scores AI2 Reasoning Challenge (ARC): 96.3%, HellaSwag: 95.3%, Uniform Bar Exam: 90.0%, SAT Math: 89.0%, LSAT: 88.0%. Grok-4 Heavy scores AIME 2025: 100.0%, HMMT25: 96.7%, GPQA: 88.4%, LiveCodeBench: 79.4%, USAMO25: 61.9%.

What are the context window sizes for GPT-4 and Grok-4 Heavy?

GPT-4 supports 33K tokens and Grok-4 Heavy supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes GPT-4 and Grok-4 Heavy?

GPT-4 is developed by OpenAI and Grok-4 Heavy is developed by xAI.

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