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 April 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.
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
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.
