OpenAI o4-mini vs Gemini 2.5 Flash Preview 05-20 (thinking)

Compare OpenAI o4-mini by OpenAI against Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI, tested across 12 shared challenges. Updated March 2026.

Which is better, OpenAI o4-mini or Gemini 2.5 Flash Preview 05-20 (thinking)?

OpenAI o4-mini and Gemini 2.5 Flash Preview 05-20 (thinking) are both competitive models. OpenAI o4-mini costs $1.1/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview 05-20 (thinking). Compare their real outputs side by side below.

Key Differences Between OpenAI o4-mini and Gemini 2.5 Flash Preview 05-20 (thinking)

OpenAI o4-mini is made by openai while Gemini 2.5 Flash Preview 05-20 (thinking) is from google. On pricing, OpenAI o4-mini costs $1.1/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview 05-20 (thinking).

Our Verdict
OpenAI o4-mini
OpenAI o4-mini
Gemini 2.5 Flash Preview 05-20 (thinking)
Gemini 2.5 Flash Preview 05-20 (thinking)

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call
FAQ

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