Gemini 3.5 Flash vs GPT-4o (Omni)
Compare Gemini 3.5 Flash by Google AI against GPT-4o (Omni) by OpenAI, context windows of 1.0M vs 128K, tested across 53 shared challenges. Updated May 2026.
Which is better, Gemini 3.5 Flash or GPT-4o (Omni)?
Gemini 3.5 Flash and GPT-4o (Omni) are both competitive models. Gemini 3.5 Flash costs $1.5/M input tokens vs $2.5/M for GPT-4o (Omni). Context windows: 1049K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between Gemini 3.5 Flash and GPT-4o (Omni)
Gemini 3.5 Flash is made by google while GPT-4o (Omni) is from openai. Gemini 3.5 Flash has a 1049K token context window compared to GPT-4o (Omni)'s 128K. On pricing, Gemini 3.5 Flash costs $1.5/M input tokens vs $2.5/M for GPT-4o (Omni).
Per 1M tokens
Gemini 3.5 Flash is cheaper on both — 1.7× input, 1.1× output
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Style Comparison
GPT-4o (Omni) uses 2.5x more emoji
