Gemini 3 Flash Preview vs GPT-5 Mini

Compare Gemini 3 Flash Preview by Google AI against GPT-5 Mini by OpenAI, tested across 46 shared challenges. Updated April 2026.

Which is better, Gemini 3 Flash Preview or GPT-5 Mini?

Gemini 3 Flash Preview and GPT-5 Mini are both competitive models. Gemini 3 Flash Preview costs $0.5/M input tokens vs $0.25/M for GPT-5 Mini. Compare their real outputs side by side below.

Key Differences Between Gemini 3 Flash Preview and GPT-5 Mini

Gemini 3 Flash Preview is made by google while GPT-5 Mini is from openai. On pricing, Gemini 3 Flash Preview costs $0.5/M input tokens vs $0.25/M for GPT-5 Mini.

Our Verdict
Gemini 3 Flash Preview
Gemini 3 Flash Preview
GPT-5 Mini
GPT-5 MiniRunner-up

No community votes yet. On paper, Gemini 3 Flash Preview has the edge — bigger model tier, newer, bigger context window.

Too close to call
Writing DNA

Style Comparison

Similarity
99%

Gemini 3 Flash Preview uses 710.1x more bold

Gemini 3 Flash Preview
GPT-5 Mini
55%Vocabulary62%
18wSentence Length21w
0.42Hedging0.16
7.1Bold0.0
4.5Lists3.4
0.00Emoji0.00
0.84Headings0.00
0.07Transitions0.05
Based on 24 + 15 text responses
vs

Ask them anything yourself

Gemini 3 Flash PreviewGPT-5 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
Free preview13 of 58 slides
FAQ

Common questions