Gemini 2.5 Flash Preview (thinking) vs o3 Mini
Compare Gemini 2.5 Flash Preview (thinking) by Google AI against o3 Mini by OpenAI, context windows of 1.0M vs 64K, tested across 20 shared challenges. Updated June 2026.
Which is better, Gemini 2.5 Flash Preview (thinking) or o3 Mini?
Gemini 2.5 Flash Preview (thinking) and o3 Mini are both competitive models. Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens vs $1.1/M for o3 Mini. Context windows: 1049K vs 64K tokens. Compare their real outputs side by side below.
Key Differences Between Gemini 2.5 Flash Preview (thinking) and o3 Mini
Gemini 2.5 Flash Preview (thinking) is made by google while o3 Mini is from openai. Gemini 2.5 Flash Preview (thinking) has a 1049K token context window compared to o3 Mini's 64K. On pricing, Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens vs $1.1/M for o3 Mini.
Per 1M tokens
Gemini 2.5 Flash Preview (thinking) is cheaper on both — 6.3× input, 1.3× output
No community votes yet. On paper, Gemini 2.5 Flash Preview (thinking) has the edge — bigger model tier, newer, bigger context window.
Style Comparison
o3 Mini uses 46.7x more headings
