GPT-4o mini vs OpenAI o4-mini

Compare GPT-4o mini and OpenAI o4-mini, both from OpenAI, tested across 34 shared challenges. Updated April 2026.

Which is better, GPT-4o mini or OpenAI o4-mini?

GPT-4o mini and OpenAI o4-mini are both competitive models. GPT-4o mini costs $0.15/M input tokens vs $1.1/M for OpenAI o4-mini. Compare their real outputs side by side below.

Key Differences Between GPT-4o mini and OpenAI o4-mini

GPT-4o mini is made by openai while OpenAI o4-mini is from openai. On pricing, GPT-4o mini costs $0.15/M input tokens vs $1.1/M for OpenAI o4-mini.

Our Verdict
OpenAI o4-mini
OpenAI o4-mini
GPT-4o mini
GPT-4o miniRunner-up

No community votes yet. On paper, OpenAI o4-mini has the edge — bigger model tier, newer.

GPT-4o mini is 7.3x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
97%

GPT-4o mini uses 384.3x more bold

GPT-4o mini
OpenAI o4-mini
54%Vocabulary73%
18wSentence Length15w
0.84Hedging0.18
3.8Bold0.0
3.3Lists2.1
0.00Emoji0.00
1.03Headings0.00
0.23Transitions0.02
Based on 22 + 10 text responses
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Ask them anything yourself

GPT-4o miniOpenAI o4-mini

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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