OpenAI Codex Mini vs Grok 3

Compare OpenAI Codex Mini by OpenAI against Grok 3 by xAI, in 2 community votes, openai codex mini wins 100% of head-to-head duels, context windows of 200K vs 128K, tested across 7 shared challenges. Updated February 2026.

In 2 community votes, OpenAI Codex Mini wins 100% of head-to-head duels. OpenAI Codex Mini leads in Image Generation. Based on blind community voting from the RIVAL open dataset of 2+ human preference judgments for this pair.

Image Generation: OpenAI Codex Mini wins 100% of votes
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