GPT-4.5 vs GPT-4o (Omni)
Compare GPT-4.5 and GPT-4o (Omni), both from OpenAI, in 7 community votes, gpt-4o (omni) wins 57% of head-to-head duels, context windows of 128K vs 128K, tested across 25 shared challenges. Updated May 2026.
Which is better, GPT-4.5 or GPT-4o (Omni)?
GPT-4o (Omni) is the better choice overall, winning 57% of 7 blind community votes on Rival. GPT-4.5 costs $75/M input tokens vs $2.5/M for GPT-4o (Omni). Context windows: 128K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-4.5 and GPT-4o (Omni)
GPT-4.5 is made by openai while GPT-4o (Omni) is from openai. GPT-4.5 has a 128K token context window compared to GPT-4o (Omni)'s 128K. On pricing, GPT-4.5 costs $75/M input tokens vs $2.5/M for GPT-4o (Omni). In community voting, In 7 community votes, GPT-4o (Omni) wins 57% of head-to-head duels.
In 7 community votes, GPT-4o (Omni) wins 57% of head-to-head duels. GPT-4o (Omni) leads in Reasoning. Based on blind community voting from the Rival open dataset of 7+ human preference judgments for this pair.
Per 1M tokens
GPT-4o (Omni) is cheaper on both — 30× input, 15× output
GPT-4o (Omni) has the edge overall. In 7 blind votes, GPT-4o (Omni) wins 57% of the time.
GPT-4o (Omni) particularly excels in Reasoning. GPT-4o (Omni) is 15x cheaper per token — worth considering if cost matters.
Style Comparison
GPT-4o (Omni) uses 2.5x more emoji
