GPT-4o (Omni) vs Horizon Alpha
Compare GPT-4o (Omni) by OpenAI against Horizon Alpha by OpenRouter, context windows of 128K vs 256K, tested across 34 shared challenges. Updated May 2026.
Which is better, GPT-4o (Omni) or Horizon Alpha?
GPT-4o (Omni) and Horizon Alpha are both competitive models. GPT-4o (Omni) costs $2.5/M input tokens vs $0/M for Horizon Alpha. Context windows: 128K vs 256K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-4o (Omni) and Horizon Alpha
GPT-4o (Omni) is made by openai while Horizon Alpha is from openrouter. GPT-4o (Omni) has a 128K token context window compared to Horizon Alpha's 256K. On pricing, GPT-4o (Omni) costs $2.5/M input tokens vs $0/M for Horizon Alpha.
Per 1M tokens
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Style Comparison
GPT-4o (Omni) uses 734.5x more bold
