ChatGPT-4o (March 2025) vs Gemini 2.5 Pro (I/O Edition)
Compare ChatGPT-4o (March 2025) by OpenAI against Gemini 2.5 Pro (I/O Edition) by Google AI, tested across 30 shared challenges. Updated May 2026.
Which is better, ChatGPT-4o (March 2025) or Gemini 2.5 Pro (I/O Edition)?
ChatGPT-4o (March 2025) and Gemini 2.5 Pro (I/O Edition) are both competitive models. ChatGPT-4o (March 2025) costs $5/M input tokens vs $1.25/M for Gemini 2.5 Pro (I/O Edition). Compare their real outputs side by side below.
Key Differences Between ChatGPT-4o (March 2025) and Gemini 2.5 Pro (I/O Edition)
ChatGPT-4o (March 2025) is made by openai while Gemini 2.5 Pro (I/O Edition) is from google. On pricing, ChatGPT-4o (March 2025) costs $5/M input tokens vs $1.25/M for Gemini 2.5 Pro (I/O Edition).
Per 1M tokens
Gemini 2.5 Pro (I/O Edition) is cheaper on both — 4.0× input, 1.5× output
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Style Comparison
ChatGPT-4o (March 2025) uses 94.5x more emoji
