ChatGPT-4o (March 2025) vs OpenAI Codex Mini
Compare ChatGPT-4o (March 2025) and OpenAI Codex Mini, both from OpenAI, context windows of 128K vs 200K, tested across 7 shared challenges. Updated April 2026.
Which is better, ChatGPT-4o (March 2025) or OpenAI Codex Mini?
ChatGPT-4o (March 2025) and OpenAI Codex Mini are both competitive models. ChatGPT-4o (March 2025) costs $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 ChatGPT-4o (March 2025) and OpenAI Codex Mini
ChatGPT-4o (March 2025) is made by openai while OpenAI Codex Mini is from openai. ChatGPT-4o (March 2025) has a 128K token context window compared to OpenAI Codex Mini's 200K. On pricing, ChatGPT-4o (March 2025) costs $5/M input tokens vs $1.5/M for 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.
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Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
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12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
