Gemini 2.5 Flash Preview 05-20 (thinking) vs GPT-5
Compare Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI against GPT-5 by OpenAI, context windows of 1.0M vs 400K, tested across 12 shared challenges. Updated May 2026.
Which is better, Gemini 2.5 Flash Preview 05-20 (thinking) or GPT-5?
Gemini 2.5 Flash Preview 05-20 (thinking) and GPT-5 are both competitive models. Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens vs $1.25/M for GPT-5. Context windows: 1049K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between Gemini 2.5 Flash Preview 05-20 (thinking) and GPT-5
Gemini 2.5 Flash Preview 05-20 (thinking) is made by google while GPT-5 is from openai. Gemini 2.5 Flash Preview 05-20 (thinking) has a 1049K token context window compared to GPT-5's 400K. On pricing, Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens vs $1.25/M for GPT-5.
Per 1M tokens
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 8.3× input, 2.9× output
No community votes yet. On paper, GPT-5 has the edge — bigger model tier, newer.
Style Comparison
GPT-5 uses 19.5x more hedging
