[Case Study]
Gemini 2.5 vs ChatGPT-4o: A Practical AI Model Comparison
By Krizma Nagi
LinkedIn Profile
Introduction
At Think Technologies, we believe real-world testing tells a clearer story than benchmarks alone. In this case study, we compared Google’s Gemini 2.5 Pro and OpenAI’s ChatGPT-4o using identical prompts designed to reflect practical business and technical use cases.
What We Test
A sustainability strategy for reducing carbon footprint by 30% in 18 months
A Python programming task to identify the most common words in a text file, excluding stopwords
Key Differences
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Gemini 2.5 Pro favors detailed planning and structured rollouts
ChatGPT-4o leans into fast execution and immediate actions
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Gemini reads like a traditional enterprise report
ChatGPT offers a user-friendly, visually engaging experience (even using emojis)
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Gemini delivers production-ready, extensively documented code
ChatGPT creates fast, readable solutions optimized for quick deployment
Which Model Fits Your Use Case
Our Takeaway
Model selection isn’t just about raw performance — it’s about fit. Gemini’s methodical depth suits complex, high-stakes environments, while ChatGPT’s speed and usability make it a great choice for fast-paced teams. The best outcomes may come from combining both.