o3 Mini vs Gemini 2.5 Flash Preview (thinking)

Compare o3 Mini by OpenAI against Gemini 2.5 Flash Preview (thinking) by Google AI, context windows of 64K vs 1.0M, tested across 14 shared challenges. Updated March 2026.

Which is better, o3 Mini or Gemini 2.5 Flash Preview (thinking)?

o3 Mini and Gemini 2.5 Flash Preview (thinking) are both competitive models. o3 Mini costs $1.1/M input tokens vs $0.175/M for Gemini 2.5 Flash Preview (thinking). Context windows: 64K vs 1049K tokens. Compare their real outputs side by side below.

Key Differences Between o3 Mini and Gemini 2.5 Flash Preview (thinking)

o3 Mini is made by openai while Gemini 2.5 Flash Preview (thinking) is from google. o3 Mini has a 64K token context window compared to Gemini 2.5 Flash Preview (thinking)'s 1049K. On pricing, o3 Mini costs $1.1/M input tokens vs $0.175/M for Gemini 2.5 Flash Preview (thinking).

Our Verdict
Gemini 2.5 Flash Preview (thinking)
Gemini 2.5 Flash Preview (thinking)
o3 Mini
o3 MiniRunner-up

No community votes yet. On paper, Gemini 2.5 Flash Preview (thinking) has the edge — bigger model tier, newer, bigger context window.

Slight edge
FAQ

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