OpenAI GPT-4.5 vs xAI Grok 2

Name: OpenAI GPT-4.5
Brand: OpenAI
SKU: gpt-4-5

Looking for an honest OpenAI GPT-4.5 vs xAI Grok 2 comparison in 2026? We scored both ai language models on the same six-dimension framework — performance, battery, display, camera, design and value — using identical methodology, so the numbers below are directly comparable. In our overall scoring the xAI Grok 2 comes out ahead 51/100 to 63/100 — a 12-point gap. The widest gap is in design and build, where the OpenAI GPT-4.5 pulls noticeably ahead.

OpenAI

GPT-4.5

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AI Matrix

xAI Grok 2 edges out the OpenAI GPT-4.5 in the ai language models category, especially in value, scoring 63 vs 51. If you want the better overall ai language models, xAI Grok 2 is the recommended choice.

Reviewed by VersusMatrix Editorial Team|Our methodology

3 Reasons Why xAI Grok 2 Is Better

1.Better display rating: 29 vs 11
2.Better value score: 90 vs 0
3.Higher overall score: 63 vs 51

Desglose de Puntajes

OpenAI GPT-4.5xAI Grok 2

Benchmark (MMLU)30% weight

OpenAI GPT-4.5 Ganador

Cost Efficiency20% weight

xAI Grok 2 Ganador

Arena ELO20% weight

OpenAI GPT-4.5 Ganador

Context Window10% weight

Empate

Speed (tok/s)10% weight

xAI Grok 2 Ganador

Coding (HumanEval)10% weight

Empate

Scores are relative within the ai language modelscategory. Percentages show each dimension's weight in the overall score. A difference of less than 0.5 points is considered a tie.

OpenAI GPT-4.5

✓ Pros

●Higher performance score
●Better design score

✗ Cons

●Higher price relative to value
●Lower display score

xAI Grok 2

Ganador

✓ Pros

●Better display score
●Better value for money

✗ Cons

●Lower performance score

💰 Token Pricing (per 1M tokens)

Lower cost = better value. Free = open-source self-hosted.

Metric	OpenAI GPT-4.5	Grok 2
Input (Prompt)	$75.00/1M	✓$2.00/1M
Output (Completion)	$150.00/1M	✓$10.00/1M
Open Source	Proprietary	Proprietary

⚡ Context Window & Speed

Context Window (tokens)

OpenAI GPT-4.5128K

Grok 2131K

Metric	OpenAI GPT-4.5	Grok 2
Max Output	✓16,384 tok	4,096 tok
Speed	50 tok/s	✓100 tok/s
Time to First Token	900ms	✓600ms
Languages	✓50+	25+

📊 Benchmark Scores

Higher is better. Industry-standard AI evaluation benchmarks.

OpenAI GPT-4.5

Grok 2

MMLU (Knowledge)

90.0|87.5

OpenAI GPT-4.5

Grok 2

HumanEval (Coding)

88.0|88.4

OpenAI GPT-4.5

Grok 2

MATH (Mathematics)

78.0|76.1

OpenAI GPT-4.5

Grok 2

GPQA (Expert Q&A)

72.0|56.0

OpenAI GPT-4.5

Grok 2

Chatbot Arena ELO

1370.0|1290.0

OpenAI GPT-4.5

Grok 2

🔧 Capabilities

Feature	OpenAI GPT-4.5	Grok 2
Reasoning / Chain-of-Thought	✕	✕
Vision (Image Input)	✓	✓
Audio Input	✕	✕
Video Input	✕	✕
Image/Audio Output	✕	✕
Function Calling / Tools	✓	✓
JSON Mode	✓	✓
Real-time Web Access	✕	✓
Fine-tuning Support	✕	✕
Batch API	✓	✕
Streaming	✓	✓
Open Source	✕	✕

ℹ️ Model Details

Field	OpenAI GPT-4.5	Grok 2
Provider	OpenAI	xAI
Knowledge Cutoff	2024-09	real-time
Best For	creative writingemotional intelligenceconversationnuanced tasks	current eventsresearchreal time infogeneral

Quién Debería Comprar

Buy OpenAI GPT-4.5 if…

The OpenAI GPT-4.5 is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.

Buy xAI Grok 2 if…

Buy the xAI Grok 2 if you want the best overall value in this comparison. It scores higher overall and is the recommended choice for most buyers.