Claude Haiku 4.5 vs OpenAI Codex Mini

Compare Claude Haiku 4.5 by Anthropic against OpenAI Codex Mini by OpenAI, in 3 community votes, claude haiku 4.5 wins 100% of head-to-head duels, context windows of 200K vs 200K, tested across 10 shared challenges. Updated February 2026.

In 3 community votes, Claude Haiku 4.5 wins 100% of head-to-head duels. Based on blind community voting from the RIVAL open dataset of 3+ human preference judgments for this pair.

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