OpenAI GPT-4.5 vs Meta Llama 3.1 405B

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

Looking for an honest OpenAI GPT-4.5 vs Meta Llama 3.1 405B 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 Meta Llama 3.1 405B comes out ahead 51/100 to 62/100 — a 11-point gap. The widest gap is in design and build, where the OpenAI GPT-4.5 pulls noticeably ahead.

OpenAI

GPT-4.5

Prices may vary · We may earn a commission on purchases. Learn more

AI Matrix

Meta Llama 3.1 405B edges out the OpenAI GPT-4.5 in the ai language models category, especially in value, scoring 62 vs 51. If you want the better overall ai language models, Meta Llama 3.1 405B is the recommended choice.

Reviewed by VersusMatrix Editorial Team|Our methodology

2 Reasons Why Meta Llama 3.1 405B Is Better

1.Better value score: 100 vs 0
2.Higher overall score: 62 vs 51

Punktaufteilung

OpenAI GPT-4.5Meta Llama 3.1 405B

Benchmark (MMLU)30% weight

Unentschieden

Cost Efficiency20% weight

100

Meta Llama 3.1 405B Gewinner

Arena ELO20% weight

OpenAI GPT-4.5 Gewinner

Context Window10% weight

Unentschieden

Speed (tok/s)10% weight

OpenAI GPT-4.5 Gewinner

Coding (HumanEval)10% weight

Unentschieden

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

●Better display score
●Better design score

✗ Cons

●Higher price relative to value

Meta Llama 3.1 405B

Gewinner

✓ Pros

●Better value for money

✗ Cons

●Lower display score

💰 Token Pricing (per 1M tokens)

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

Metric	OpenAI GPT-4.5	3.1 405B
Input (Prompt)	$75.00/1M	✓Free/1M
Output (Completion)	$150.00/1M	✓Free/1M
Open Source	Proprietary	✓ Free

⚡ Context Window & Speed

Context Window (tokens)

OpenAI GPT-4.5128K

3.1 405B128K

Metric	OpenAI GPT-4.5	3.1 405B
Max Output	✓16,384 tok	4,096 tok
Speed	✓50 tok/s	30 tok/s
Time to First Token	✓900ms	1.5s
Languages	✓50+	8+

📊 Benchmark Scores

Higher is better. Industry-standard AI evaluation benchmarks.

OpenAI GPT-4.5

3.1 405B

MMLU (Knowledge)

90.0|88.6

OpenAI GPT-4.5

3.1 405B

HumanEval (Coding)

88.0|89.0

OpenAI GPT-4.5

3.1 405B

MATH (Mathematics)

78.0|73.8

OpenAI GPT-4.5

3.1 405B

GPQA (Expert Q&A)

72.0|51.1

OpenAI GPT-4.5

3.1 405B

Chatbot Arena ELO

1370.0|1270.0

OpenAI GPT-4.5

3.1 405B

🔧 Capabilities

Feature	OpenAI GPT-4.5	3.1 405B
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	3.1 405B
Provider	OpenAI	Meta
Parameters	—	405B
Knowledge Cutoff	2024-09	2023-12
License	Commercial	Llama 3.1 Community
Best For	creative writingemotional intelligenceconversationnuanced tasks	open sourceself hostingfine tuningenterprise privacy

Wer sollte kaufen

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 Meta Llama 3.1 405B if…

Buy the Meta Llama 3.1 405B if you want the best overall value in this comparison. It scores higher overall and is the recommended choice for most buyers.