GPT-4 vs OpenAI o3

Compare GPT-4 and OpenAI o3, both from OpenAI, tested across 21 shared challenges. Updated April 2026.

Which is better, GPT-4 or OpenAI o3?

GPT-4 and OpenAI o3 are both competitive models. GPT-4 costs $30/M input tokens vs $10/M for OpenAI o3. Compare their real outputs side by side below.

Key Differences Between GPT-4 and OpenAI o3

GPT-4 is made by openai while OpenAI o3 is from openai. On pricing, GPT-4 costs $30/M input tokens vs $10/M for OpenAI o3.

Our Verdict
GPT-4
GPT-4
OpenAI o3
OpenAI o3

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
98%

OpenAI o3 uses 37.9x more headings

GPT-4
OpenAI o3
59%Vocabulary68%
18wSentence Length14w
1.10Hedging0.26
0.8Bold0.7
2.5Lists3.0
0.00Emoji0.00
0.00Headings0.38
0.45Transitions0.12
Based on 15 + 16 text responses
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Ask them anything yourself

GPT-4OpenAI o3

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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