GPT-4.5 vs DeepSeek Prover V2

Compare GPT-4.5 by OpenAI against DeepSeek Prover V2 by DeepSeek, context windows of 128K vs 164K, tested across 6 shared challenges. Updated April 2026.

Which is better, GPT-4.5 or DeepSeek Prover V2?

GPT-4.5 and DeepSeek Prover V2 are both competitive models. GPT-4.5 costs $75/M input tokens vs $0/M for DeepSeek Prover V2. Context windows: 128K vs 164K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4.5 and DeepSeek Prover V2

GPT-4.5 is made by openai while DeepSeek Prover V2 is from deepseek. GPT-4.5 has a 128K token context window compared to DeepSeek Prover V2's 164K. On pricing, GPT-4.5 costs $75/M input tokens vs $0/M for DeepSeek Prover V2.

Our Verdict
GPT-4.5
GPT-4.5
DeepSeek Prover V2
DeepSeek Prover V2

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call
Writing DNA

Style Comparison

Similarity
65%

GPT-4.5 uses 56.5x more hedging

GPT-4.5
DeepSeek Prover V2
63%Vocabulary47%
16wSentence Length8w
0.57Hedging0.00
4.7Bold3.1
6.4Lists0.0
0.00Emoji0.00
1.30Headings0.35
0.54Transitions0.19
Based on 11 + 1 text responses
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GPT-4.5DeepSeek Prover V2

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
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