GPT-4o (Omni) vs Llama 3.1 405B
Compare GPT-4o (Omni) by OpenAI against Llama 3.1 405B by Meta AI, context windows of 128K vs 128K, tested across 12 shared challenges. Updated May 2026.
Which is better, GPT-4o (Omni) or Llama 3.1 405B?
GPT-4o (Omni) and Llama 3.1 405B are both competitive models. GPT-4o (Omni) costs $2.5/M input tokens vs $2.7/M for Llama 3.1 405B. Context windows: 128K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-4o (Omni) and Llama 3.1 405B
GPT-4o (Omni) is made by openai while Llama 3.1 405B is from meta. GPT-4o (Omni) has a 128K token context window compared to Llama 3.1 405B's 128K. On pricing, GPT-4o (Omni) costs $2.5/M input tokens vs $2.7/M for Llama 3.1 405B.
Per 1M tokens
GPT-4o (Omni) wins input (1.1× cheaper)·Llama 3.1 405B wins output (3.2× cheaper)
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Llama 3.1 405B is 3.2x cheaper per token — worth considering if cost matters.
Style Comparison
GPT-4o (Omni) uses 734.5x more bold
