Model Comparison

GPT-4o vs Grok-2

Grok-2 shows notably better performance in the majority of benchmarks. Grok-2 is 1.1x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

GPT-4o outperforms in 2 benchmarks (GPQA, MMMU), while Grok-2 is better at 4 benchmarks (DocVQA, MathVista, MMLU, MMLU-Pro).

Grok-2 shows notably better performance in the majority of benchmarks.

Sun Apr 05 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok-2 costs less

For input processing, GPT-4o ($2.50/1M tokens) is 1.3x more expensive than Grok-2 ($2.00/1M tokens).

For output processing, GPT-4o ($10.00/1M tokens) costs the same as Grok-2 ($10.00/1M tokens).

In conclusion, GPT-4o is more expensive than Grok-2.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sun Apr 05 2026 • llm-stats.com
OpenAI
GPT-4o
Input tokens$2.50
Output tokens$10.00
Best providerAzure
xAI
Grok-2
Input tokens$2.00
Output tokens$10.00
Best providerxAI
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Context Window

Maximum input and output token capacity

Both models have the same input context window of 128,000 tokens. GPT-4o can generate longer responses up to 16,384 tokens, while Grok-2 is limited to 8,000 tokens.

OpenAI
GPT-4o
Input128,000 tokens
Output16,384 tokens
xAI
Grok-2
Input128,000 tokens
Output8,000 tokens
Sun Apr 05 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-4o and Grok-2 support multimodal inputs.

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

GPT-4o

Text
Images
Audio
Video

Grok-2

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-4o

Proprietary

Closed source

Grok-2

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-4o was released on 2024-08-06, while Grok-2 was released on 2024-08-13.

Grok-2 is 0 month newer than GPT-4o.

GPT-4o

Aug 6, 2024

1.7 years ago

Grok-2

Aug 13, 2024

1.6 years ago

1w newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

GPT-4o is available from Azure, OpenAI. Grok-2 is available from xAI.

GPT-4o

azure logo
Azure
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M
openai logo
OpenAI
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M

Grok-2

xai logo
xAI
Input Price:Input: $2.00/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
Higher GPQA score (70.1% vs 56.0%)
Higher MMMU score (72.2% vs 66.1%)
xAI
Less expensive input tokens
Higher DocVQA score (93.6% vs 92.8%)
Higher MathVista score (69.0% vs 61.4%)
Higher MMLU score (87.5% vs 85.7%)
Higher MMLU-Pro score (75.5% vs 74.7%)

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-4o
xAI
Grok-2

FAQ

Common questions about GPT-4o vs Grok-2

Grok-2 shows notably better performance in the majority of benchmarks. GPT-4o is made by OpenAI and Grok-2 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
GPT-4o scores AI2D: 94.2%, DocVQA: 92.8%, ChartQA: 85.7%, MMLU: 85.7%, CharXiv-D: 85.3%. Grok-2 scores DocVQA: 93.6%, HumanEval: 88.4%, MMLU: 87.5%, MATH: 76.1%, MMLU-Pro: 75.5%.
Grok-2 is 1.3x cheaper for input tokens. GPT-4o costs $2.50/M input and $10.00/M output via azure. Grok-2 costs $2.00/M input and $10.00/M output via xai.
GPT-4o supports 128K tokens and Grok-2 supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include input pricing ($2.50 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.
GPT-4o is developed by OpenAI and Grok-2 is developed by xAI.