ChatGPT-4o (March 2025) vs Gemini 2.5 Flash Preview

Compare ChatGPT-4o (March 2025) by OpenAI against Gemini 2.5 Flash Preview by Google AI, in 2 community votes, gemini 2.5 flash preview wins 100% of head-to-head duels, context windows of 128K vs 1.0M, tested across 16 shared challenges. Updated March 2026.

Which is better, ChatGPT-4o (March 2025) or Gemini 2.5 Flash Preview?

Gemini 2.5 Flash Preview is the better choice overall, winning 100% of 2 blind community votes on Rival. ChatGPT-4o (March 2025) costs $5/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview. Context windows: 128K vs 1049K tokens. Compare their real outputs side by side below.

Key Differences Between ChatGPT-4o (March 2025) and Gemini 2.5 Flash Preview

ChatGPT-4o (March 2025) is made by openai while Gemini 2.5 Flash Preview is from google. ChatGPT-4o (March 2025) has a 128K token context window compared to Gemini 2.5 Flash Preview's 1049K. On pricing, ChatGPT-4o (March 2025) costs $5/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview. In community voting, In 2 community votes, Gemini 2.5 Flash Preview wins 100% of head-to-head duels.

In 2 community votes, Gemini 2.5 Flash Preview wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 2+ human preference judgments for this pair.

Our Verdict
Gemini 2.5 Flash Preview
Gemini 2.5 Flash PreviewWinner
ChatGPT-4o (March 2025)
ChatGPT-4o (March 2025)Runner-up

Pick Gemini 2.5 Flash Preview. In 2 blind votes, Gemini 2.5 Flash Preview wins 100% of the time. That's not luck.

Gemini 2.5 Flash Preview is 25x cheaper per token — worth considering if cost matters.

Clear winner
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