GPT-4o (Omni) vs GPT-5 Pro
Compare GPT-4o (Omni) and GPT-5 Pro, both from OpenAI, context windows of 128K vs 400K, tested across 42 shared challenges. Updated May 2026.
Which is better, GPT-4o (Omni) or GPT-5 Pro?
GPT-4o (Omni) and GPT-5 Pro are both competitive models. GPT-4o (Omni) costs $2.5/M input tokens vs $15/M for GPT-5 Pro. Context windows: 128K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-4o (Omni) and GPT-5 Pro
GPT-4o (Omni) is made by openai while GPT-5 Pro is from openai. GPT-4o (Omni) has a 128K token context window compared to GPT-5 Pro's 400K. On pricing, GPT-4o (Omni) costs $2.5/M input tokens vs $15/M for GPT-5 Pro.
Per 1M tokens
GPT-4o (Omni) is cheaper on both — 6.0× input, 12× output
No community votes yet. On paper, GPT-5 Pro has the edge — newer, bigger context window.
GPT-4o (Omni) is 12x cheaper per token — worth considering if cost matters.
Style Comparison
GPT-4o (Omni) uses 734.5x more bold
