GPT-4o (Omni) vs Kimi K2 Thinking

Compare GPT-4o (Omni) by OpenAI against Kimi K2 Thinking by Moonshot AI, context windows of 128K vs 262K, tested across 34 shared challenges. Updated March 2026.

Which is better, GPT-4o (Omni) or Kimi K2 Thinking?

GPT-4o (Omni) and Kimi K2 Thinking are both competitive models. GPT-4o (Omni) costs $2.5/M input tokens vs $0.6/M for Kimi K2 Thinking. Context windows: 128K vs 262K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4o (Omni) and Kimi K2 Thinking

GPT-4o (Omni) is made by openai while Kimi K2 Thinking is from moonshotai. GPT-4o (Omni) has a 128K token context window compared to Kimi K2 Thinking's 262K. On pricing, GPT-4o (Omni) costs $2.5/M input tokens vs $0.6/M for Kimi K2 Thinking.

Our Verdict
GPT-4o (Omni)
GPT-4o (Omni)
Kimi K2 Thinking
Kimi K2 Thinking

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Kimi K2 Thinking is 4.0x cheaper per token — worth considering if cost matters.

Too close to call
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