GPT-3.5 Turbo vs OpenAI o4-mini

Compare GPT-3.5 Turbo and OpenAI o4-mini, both from OpenAI, tested across 19 shared challenges. Updated April 2026.

Which is better, GPT-3.5 Turbo or OpenAI o4-mini?

GPT-3.5 Turbo and OpenAI o4-mini are both competitive models. GPT-3.5 Turbo costs $1.5/M input tokens vs $1.1/M for OpenAI o4-mini. Compare their real outputs side by side below.

Key Differences Between GPT-3.5 Turbo and OpenAI o4-mini

GPT-3.5 Turbo is made by openai while OpenAI o4-mini is from openai. On pricing, GPT-3.5 Turbo costs $1.5/M input tokens vs $1.1/M for OpenAI o4-mini.

Our Verdict
GPT-3.5 Turbo
GPT-3.5 Turbo
OpenAI o4-mini
OpenAI o4-mini

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
96%

GPT-3.5 Turbo uses 25.2x more transitions

GPT-3.5 Turbo
OpenAI o4-mini
61%Vocabulary73%
16wSentence Length15w
0.23Hedging0.18
0.0Bold0.0
3.7Lists2.1
0.00Emoji0.00
0.00Headings0.00
0.38Transitions0.02
Based on 11 + 10 text responses
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GPT-3.5 TurboOpenAI 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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