GPT-4o (Omni) vs Kimi K2
Compare GPT-4o (Omni) by OpenAI against Kimi K2 by Moonshot AI, in 5 community votes, kimi k2 wins 100% of head-to-head duels, tested across 54 shared challenges. Updated May 2026.
Which is better, GPT-4o (Omni) or Kimi K2?
Kimi K2 is the better choice overall, winning 100% of 5 blind community votes on Rival. GPT-4o (Omni) costs $2.5/M input tokens vs $0.57/M for Kimi K2. Compare their real outputs side by side below.
Key Differences Between GPT-4o (Omni) and Kimi K2
GPT-4o (Omni) is made by openai while Kimi K2 is from moonshotai. On pricing, GPT-4o (Omni) costs $2.5/M input tokens vs $0.57/M for Kimi K2. In community voting, In 5 community votes, Kimi K2 wins 100% of head-to-head duels.
In 5 community votes, Kimi K2 wins 100% of head-to-head duels. Kimi K2 leads in Conversation. Based on blind community voting from the Rival open dataset of 5+ human preference judgments for this pair.
Per 1M tokens
Kimi K2 is cheaper on both — 4.4× input, 4.3× output
Pick Kimi K2. In 5 blind votes, Kimi K2 wins 100% of the time. That's not luck.
Kimi K2 particularly excels in Conversation. Kimi K2 is 4.3x cheaper per token — worth considering if cost matters.
Style Comparison
Kimi K2 uses 27.3x more emoji
