DeepSeek V3 vs OpenAI GPT-4.5

Name: DeepSeek V3
Brand: DeepSeek
SKU: deepseek-v3

Looking for an honest DeepSeek V3 vs OpenAI GPT-4.5 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 DeepSeek V3 comes out ahead 65/100 to 51/100 — a 14-point gap. The widest gap is in design and build, where the OpenAI GPT-4.5 pulls noticeably ahead.

GAGNANT

DeepSeek

DeepSeek V3

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AI Matrix

DeepSeek V3 edges out the OpenAI GPT-4.5 in the ai language models category, especially in value, scoring 65 vs 51. If you want the better overall ai language models, DeepSeek V3 is the recommended choice.

Reviewed by VersusMatrix Editorial Team|Our methodology

2 Reasons Why DeepSeek V3 Is Better

1.Better value score: 99 vs 0
2.Higher overall score: 65 vs 51

Détail des scores

DeepSeek V3OpenAI GPT-4.5

Benchmark (MMLU)30% weight

Égalité

Cost Efficiency20% weight

DeepSeek V3 Gagnant

Arena ELO20% weight

OpenAI GPT-4.5 Gagnant

Context Window10% weight

Égalité

Speed (tok/s)10% weight

Égalité

Coding (HumanEval)10% weight

OpenAI GPT-4.5 Gagnant

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.

DeepSeek V3

Gagnant

✓ Pros

●Better value for money

✗ Cons

●Lower camera score
●Lower performance score

OpenAI GPT-4.5

✓ Pros

●Higher performance score
●Better camera score
●Better design score

✗ Cons

●Higher price relative to value

💰 Token Pricing (per 1M tokens)

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

Metric	DeepSeek V3	OpenAI GPT-4.5
Input (Prompt)	✓$0.27/1M	$75.00/1M
Output (Completion)	✓$1.10/1M	$150.00/1M
Open Source	✓ Free	Proprietary

⚡ Context Window & Speed

Context Window (tokens)

DeepSeek V3128K

OpenAI GPT-4.5128K

Metric	DeepSeek V3	OpenAI GPT-4.5
Max Output	8,192 tok	✓16,384 tok
Speed	✓60 tok/s	50 tok/s
Time to First Token	✓800ms	900ms
Languages	20+	✓50+

📊 Benchmark Scores

Higher is better. Industry-standard AI evaluation benchmarks.

DeepSeek V3

OpenAI GPT-4.5

MMLU (Knowledge)

88.5|90.0

DeepSeek V3

OpenAI GPT-4.5

HumanEval (Coding)

82.6|88.0

DeepSeek V3

OpenAI GPT-4.5

MATH (Mathematics)

75.7|78.0

DeepSeek V3

OpenAI GPT-4.5

GPQA (Expert Q&A)

59.1|72.0

DeepSeek V3

OpenAI GPT-4.5

Chatbot Arena ELO

1318.0|1370.0

DeepSeek V3

OpenAI GPT-4.5

🔧 Capabilities

Feature	DeepSeek V3	OpenAI GPT-4.5
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	DeepSeek V3	OpenAI GPT-4.5
Provider	DeepSeek	OpenAI
Parameters	671B (37B active)	—
Knowledge Cutoff	2024-07	2024-09
License	MIT	Commercial
Best For	cost efficiencycodingopen sourcegeneral	creative writingemotional intelligenceconversationnuanced tasks

Qui devrait acheter

Buy DeepSeek V3 if…

Buy the DeepSeek V3 if you want the best overall value in this comparison. It scores higher overall and is the recommended choice for most buyers.

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.