Model Comparison

GPT-4.5 vs Grok-2

GPT-4.5 significantly outperforms across most benchmarks. Grok-2 is 23.4x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

GPT-4.5 outperforms in 4 benchmarks (GPQA, MathVista, MMLU, MMMU), while Grok-2 is better at 1 benchmark (HumanEval).

GPT-4.5 significantly outperforms across most benchmarks.

Tue May 26 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok-2 costs less

For input processing, GPT-4.5 ($75.00/1M tokens) is 37.5x more expensive than Grok-2 ($2.00/1M tokens).

For output processing, GPT-4.5 ($150.00/1M tokens) is 15.0x more expensive than Grok-2 ($10.00/1M tokens).

In conclusion, GPT-4.5 is more expensive than Grok-2.*

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

Lowest available price from all providers
Tue May 26 2026 • llm-stats.com
OpenAI
GPT-4.5
Input tokens$75.00
Output tokens$150.00
Best providerOpenAI
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. Grok-2 can generate longer responses up to 8,000 tokens, while GPT-4.5 is limited to 4,096 tokens.

OpenAI
GPT-4.5
Input128,000 tokens
Output4,096 tokens
xAI
Grok-2
Input128,000 tokens
Output8,000 tokens
Tue May 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-4.5 and Grok-2 support multimodal inputs.

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

GPT-4.5

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-4.5

Proprietary

Closed source

Grok-2

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-4.5 was released on 2025-02-27, while Grok-2 was released on 2024-08-13.

GPT-4.5 is 7 months newer than Grok-2.

GPT-4.5

Feb 27, 2025

1.2 years ago

6mo newer
Grok-2

Aug 13, 2024

1.8 years ago

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-4.5 is available from OpenAI. Grok-2 is available from xAI.

GPT-4.5

openai logo
OpenAI
Input Price:Input: $75.00/1MOutput Price:Output: $150.00/1M

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 (69.5% vs 56.0%)
Higher MathVista score (72.3% vs 69.0%)
Higher MMLU score (90.8% vs 87.5%)
Higher MMMU score (75.2% vs 66.1%)
xAI
Less expensive input tokens
Less expensive output tokens
Higher HumanEval score (88.4% vs 88.0%)

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-4.5
xAI
Grok-2

FAQ

Common questions about GPT-4.5 vs Grok-2.

Which is better, GPT-4.5 or Grok-2?

GPT-4.5 significantly outperforms across most benchmarks. GPT-4.5 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.

How does GPT-4.5 compare to Grok-2 in benchmarks?

GPT-4.5 scores GSM8k: 97.0%, MMLU: 90.8%, CharXiv-D: 90.0%, IFEval: 88.2%, HumanEval: 88.0%. Grok-2 scores DocVQA: 93.6%, HumanEval: 88.4%, MMLU: 87.5%, MATH: 76.1%, MMLU-Pro: 75.5%.

Is GPT-4.5 cheaper than Grok-2?

Grok-2 is 37.5x cheaper for input tokens. GPT-4.5 costs $75.00/M input and $150.00/M output via openai. Grok-2 costs $2.00/M input and $10.00/M output via xai.

What are the context window sizes for GPT-4.5 and Grok-2?

GPT-4.5 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.

What are the main differences between GPT-4.5 and Grok-2?

Key differences include input pricing ($75.00 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-4.5 and Grok-2?

GPT-4.5 is developed by OpenAI and Grok-2 is developed by xAI.