Gemini 1.5 Pro vs GPT-5
Compare Gemini 1.5 Pro by Google AI against GPT-5 by OpenAI, context windows of 1.0M vs 400K, tested across 19 shared challenges. Updated June 2026.
Which is better, Gemini 1.5 Pro or GPT-5?
Gemini 1.5 Pro and GPT-5 are both competitive models. Gemini 1.5 Pro costs $3.5/M input tokens vs $1.25/M for GPT-5. Context windows: 1000K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between Gemini 1.5 Pro and GPT-5
Gemini 1.5 Pro is made by google while GPT-5 is from openai. Gemini 1.5 Pro has a 1000K token context window compared to GPT-5's 400K. On pricing, Gemini 1.5 Pro costs $3.5/M input tokens vs $1.25/M for GPT-5.
API pricing
Per 1M tokens
Gemini 1.5 Pro
Input
$3.50
Output
$10.50
GPT-5
Input
$1.25
2.8× cheaper
Output
$10.00
1.1× cheaper
GPT-5 is cheaper on both — 2.8× input, 1.1× output
Our Verdict
GPT-5
Gemini 1.5 ProRunner-up
No community votes yet. On paper, GPT-5 has the edge — bigger model tier, newer.
Too close to call
Writing DNA
Style Comparison
Similarity
48%
Gemini 1.5 Pro uses 19.4x more bold
Gemini 1.5 Pro
GPT-5
61%Vocabulary65%
15wSentence Length13w
0.80Hedging0.20
3.7Bold0.2
3.3Lists4.6
0.00Emoji0.00
0.08Headings0.16
0.09Transitions0.03
Based on 8 + 16 text responses
FAQ
