OpenAI Codex Mini vs Grok 3 Thinking

Compare OpenAI Codex Mini by OpenAI against Grok 3 Thinking by xAI, in 1 community votes, openai codex mini wins 100% of head-to-head duels, context windows of 200K vs 128K, tested across 6 shared challenges. Updated February 2026.

In 1 community votes, OpenAI Codex Mini wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 1+ human preference judgments for this pair.

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