GPT-4o (Omni) vs OpenAI Codex Mini

Compare GPT-4o (Omni) and OpenAI Codex Mini, both from OpenAI, context windows of 128K vs 200K, tested across 10 shared challenges. Updated April 2026.

Which is better, GPT-4o (Omni) or OpenAI Codex Mini?

GPT-4o (Omni) and OpenAI Codex Mini are both competitive models. GPT-4o (Omni) costs $2.5/M input tokens vs $1.5/M for OpenAI Codex Mini. Context windows: 128K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4o (Omni) and OpenAI Codex Mini

GPT-4o (Omni) is made by openai while OpenAI Codex Mini is from openai. GPT-4o (Omni) has a 128K token context window compared to OpenAI Codex Mini's 200K. On pricing, GPT-4o (Omni) costs $2.5/M input tokens vs $1.5/M for OpenAI Codex Mini.

Our Verdict
GPT-4o (Omni)
GPT-4o (Omni)
OpenAI Codex Mini
OpenAI Codex Mini

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

Too close to call
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