GPT OSS 20B vs o3 Mini

Compare GPT OSS 20B and o3 Mini, both from OpenAI, in 3 community votes, o3 mini wins 67% of head-to-head duels, context windows of 131K vs 64K, tested across 39 shared challenges. Updated February 2026.

In 3 community votes, o3 Mini wins 67% of head-to-head duels. o3 Mini has the edge overall, but performance varies by task type. Based on blind community voting from the Rival open dataset of 3+ human preference judgments for this pair.

Reasoning: GPT OSS 20B and o3 Mini are tied
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