OpenAI o4-mini vs Gemini 2.5 Flash Preview (thinking)

Compare OpenAI o4-mini by OpenAI against Gemini 2.5 Flash Preview (thinking) by Google AI, in 1 community votes, openai o4-mini wins 100% of head-to-head duels, tested across 14 shared challenges. Updated March 2026.

Which is better, OpenAI o4-mini or Gemini 2.5 Flash Preview (thinking)?

OpenAI o4-mini is the better choice overall, winning 100% of 1 blind community votes on Rival. OpenAI o4-mini costs $1.1/M input tokens vs $0.175/M for Gemini 2.5 Flash Preview (thinking). Compare their real outputs side by side below.

Key Differences Between OpenAI o4-mini and Gemini 2.5 Flash Preview (thinking)

OpenAI o4-mini is made by openai while Gemini 2.5 Flash Preview (thinking) is from google. On pricing, OpenAI o4-mini costs $1.1/M input tokens vs $0.175/M for Gemini 2.5 Flash Preview (thinking). In community voting, In 1 community votes, OpenAI o4-mini wins 100% of head-to-head duels.

In 1 community votes, OpenAI o4-mini wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 1+ human preference judgments for this pair.

Our Verdict
OpenAI o4-mini
OpenAI o4-miniWinner
Gemini 2.5 Flash Preview (thinking)
Gemini 2.5 Flash Preview (thinking)Runner-up

Pick OpenAI o4-mini. In 1 blind votes, OpenAI o4-mini wins 100% of the time. That's not luck.

Clear winner
FAQ

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