GPT-4 vs GPT-5

Compare GPT-4 and GPT-5, both from OpenAI, context windows of 8K vs 400K, tested across 21 shared challenges. Updated April 2026.

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

GPT-4 and GPT-5 are both competitive models. GPT-4 costs $30/M input tokens vs $1.25/M for GPT-5. Context windows: 8K vs 400K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4 and GPT-5

GPT-4 is made by openai while GPT-5 is from openai. GPT-4 has a 8K token context window compared to GPT-5's 400K. On pricing, GPT-4 costs $30/M input tokens vs $1.25/M for GPT-5.

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

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

GPT-5 is 6.0x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
99%

GPT-5 uses 16.2x more headings

GPT-4
GPT-5
59%Vocabulary65%
18wSentence Length13w
1.10Hedging0.20
0.8Bold0.2
2.5Lists4.6
0.00Emoji0.00
0.00Headings0.16
0.45Transitions0.03
Based on 15 + 16 text responses
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Ask them anything yourself

GPT-4GPT-5

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
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