Gemini 2.5 Flash Preview 05-20 (thinking) vs OpenAI o4-mini
Compare Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI against OpenAI o4-mini by OpenAI, tested across 12 shared challenges. Updated April 2026.
Which is better, Gemini 2.5 Flash Preview 05-20 (thinking) or OpenAI o4-mini?
Gemini 2.5 Flash Preview 05-20 (thinking) and OpenAI o4-mini are both competitive models. Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens vs $1.1/M for OpenAI o4-mini. Compare their real outputs side by side below.
Key Differences Between Gemini 2.5 Flash Preview 05-20 (thinking) and OpenAI o4-mini
Gemini 2.5 Flash Preview 05-20 (thinking) is made by google while OpenAI o4-mini is from openai. On pricing, Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens vs $1.1/M for OpenAI o4-mini.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Style Comparison
OpenAI o4-mini uses 18.3x more hedging
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.
