Gemini 1.5 Pro vs GPT-4

Compare Gemini 1.5 Pro by Google AI against GPT-4 by OpenAI, context windows of 1.0M vs 8K, tested across 2 shared challenges. Updated April 2026.

Which is better, Gemini 1.5 Pro or GPT-4?

Gemini 1.5 Pro and GPT-4 are both competitive models. Gemini 1.5 Pro costs $3.5/M input tokens vs $30/M for GPT-4. Context windows: 1000K vs 8K tokens. Compare their real outputs side by side below.

Key Differences Between Gemini 1.5 Pro and GPT-4

Gemini 1.5 Pro is made by google while GPT-4 is from openai. Gemini 1.5 Pro has a 1000K token context window compared to GPT-4's 8K. On pricing, Gemini 1.5 Pro costs $3.5/M input tokens vs $30/M for GPT-4.

Our Verdict
Gemini 1.5 Pro
Gemini 1.5 Pro
GPT-4
GPT-4

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Gemini 1.5 Pro is 5.7x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
100%

Gemini 1.5 Pro uses 8.1x more headings

Gemini 1.5 Pro
GPT-4
61%Vocabulary59%
15wSentence Length18w
0.80Hedging1.10
3.7Bold0.8
3.3Lists2.5
0.00Emoji0.00
0.08Headings0.00
0.09Transitions0.45
Based on 8 + 15 text responses
vs

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Gemini 1.5 ProGPT-4

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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