GPT-4 vs GPT-5 Pro

Compare GPT-4 and GPT-5 Pro, both from OpenAI, context windows of 8K vs 400K, tested across 18 shared challenges. Updated April 2026.

Which is better, GPT-4 or GPT-5 Pro?

GPT-4 and GPT-5 Pro are both competitive models. GPT-4 costs $30/M input tokens vs $15/M for GPT-5 Pro. Context windows: 8K vs 400K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4 and GPT-5 Pro

GPT-4 is made by openai while GPT-5 Pro is from openai. GPT-4 has a 8K token context window compared to GPT-5 Pro's 400K. On pricing, GPT-4 costs $30/M input tokens vs $15/M for GPT-5 Pro.

Our Verdict
GPT-5 Pro
GPT-5 Pro
GPT-4
GPT-4Runner-up

No community votes yet. On paper, GPT-5 Pro has the edge — newer, bigger context window.

Too close to call
Writing DNA

Style Comparison

Similarity
99%

GPT-4 uses 82.3x more bold

GPT-4
GPT-5 Pro
59%Vocabulary65%
18wSentence Length15w
1.10Hedging0.32
0.8Bold0.0
2.5Lists2.9
0.00Emoji0.00
0.00Headings0.00
0.45Transitions0.01
Based on 15 + 11 text responses
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Ask them anything yourself

GPT-4GPT-5 Pro

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
Free preview13 of 58 slides
FAQ

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