OpenAI Codex Mini vs Gemini 3.1 Pro Preview
Compare OpenAI Codex Mini by OpenAI against Gemini 3.1 Pro Preview by Google AI, context windows of 200K vs 1.0M, tested across 10 shared challenges. Updated April 2026.
Which is better, OpenAI Codex Mini or Gemini 3.1 Pro Preview?
OpenAI Codex Mini and Gemini 3.1 Pro Preview are both competitive models. OpenAI Codex Mini costs $1.5/M input tokens vs $2/M for Gemini 3.1 Pro Preview. Context windows: 200K vs 1049K tokens. Compare their real outputs side by side below.
Key Differences Between OpenAI Codex Mini and Gemini 3.1 Pro Preview
OpenAI Codex Mini is made by openai while Gemini 3.1 Pro Preview is from google. OpenAI Codex Mini has a 200K token context window compared to Gemini 3.1 Pro Preview's 1049K. On pricing, OpenAI Codex Mini costs $1.5/M input tokens vs $2/M for Gemini 3.1 Pro Preview.
No community votes yet. On paper, Gemini 3.1 Pro Preview has the edge — bigger model tier, newer, bigger context window.
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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
models
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.
