Claude Sonnet 4 vs GPT OSS 20B

Compare Claude Sonnet 4 by Anthropic against GPT OSS 20B by OpenAI, in 33 community votes, claude sonnet 4 wins 90% of head-to-head duels, context windows of 200K vs 131K, tested across 34 shared challenges. Updated February 2026.

In 33 community votes, Claude Sonnet 4 wins 90% of head-to-head duels. Claude Sonnet 4 leads in Web Design, Image Generation, Reasoning. Based on blind community voting from the RIVAL open dataset of 33+ human preference judgments for this pair.

Web Design: Claude Sonnet 4 wins 92% of votes
Image Generation: Claude Sonnet 4 wins 100% of votes
Reasoning: Claude Sonnet 4 wins 83% of votes
Conversation: Claude Sonnet 4 wins 100% of votes
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