Gemini 2.5 Flash Preview (thinking) vs GPT-5
Compare Gemini 2.5 Flash Preview (thinking) by Google AI against GPT-5 by OpenAI, in 2 community votes, gpt-5 wins 100% of head-to-head duels, context windows of 1.0M vs 400K, tested across 20 shared challenges. Updated May 2026.
Which is better, Gemini 2.5 Flash Preview (thinking) or GPT-5?
GPT-5 is the better choice overall, winning 100% of 2 blind community votes on Rival. Gemini 2.5 Flash Preview (thinking) costs $0.175/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 (thinking) and GPT-5
Gemini 2.5 Flash Preview (thinking) is made by google while GPT-5 is from openai. Gemini 2.5 Flash Preview (thinking) has a 1049K token context window compared to GPT-5's 400K. On pricing, Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens vs $1.25/M for GPT-5. In community voting, In 2 community votes, GPT-5 wins 100% of head-to-head duels.
In 2 community votes, GPT-5 wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 2+ human preference judgments for this pair.
Per 1M tokens
Gemini 2.5 Flash Preview (thinking) is cheaper on both — 7.1× input, 2.9× output
Pick GPT-5. In 2 blind votes, GPT-5 wins 100% of the time. That's not luck.
Style Comparison
GPT-5 uses 16.2x more headings
