ChatGPT-4o (March 2025) vs Gemini 2.5 Flash Preview (thinking)
Compare ChatGPT-4o (March 2025) by OpenAI against Gemini 2.5 Flash Preview (thinking) by Google AI, in 7 community votes, chatgpt-4o (march 2025) wins 67% of head-to-head duels, context windows of 128K vs 1.0M, tested across 12 shared challenges. Updated April 2026.
Which is better, ChatGPT-4o (March 2025) or Gemini 2.5 Flash Preview (thinking)?
ChatGPT-4o (March 2025) is the better choice overall, winning 67% of 7 blind community votes on Rival. ChatGPT-4o (March 2025) costs $5/M input tokens vs $0.175/M for Gemini 2.5 Flash Preview (thinking). 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 (thinking)
ChatGPT-4o (March 2025) is made by openai while Gemini 2.5 Flash Preview (thinking) is from google. ChatGPT-4o (March 2025) has a 128K token context window compared to Gemini 2.5 Flash Preview (thinking)'s 1049K. On pricing, ChatGPT-4o (March 2025) costs $5/M input tokens vs $0.175/M for Gemini 2.5 Flash Preview (thinking). In community voting, In 7 community votes, ChatGPT-4o (March 2025) wins 67% of head-to-head duels.
In 7 community votes, ChatGPT-4o (March 2025) wins 67% of head-to-head duels. ChatGPT-4o (March 2025) leads in Reasoning. Based on blind community voting from the Rival open dataset of 7+ human preference judgments for this pair.
Pick ChatGPT-4o (March 2025). In 7 blind votes, ChatGPT-4o (March 2025) wins 67% of the time. That's not luck.
ChatGPT-4o (March 2025) particularly excels in Reasoning. Gemini 2.5 Flash Preview (thinking) is 4.3x cheaper per token — worth considering if cost matters.
Style Comparison
ChatGPT-4o (March 2025) uses 94.5x more emoji
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
