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Claude Haiku 4.5 vs GPT OSS 120B

Compare Claude Haiku 4.5 by Anthropic against GPT OSS 120B by OpenAI, in 9 community votes, claude haiku 4.5 wins 86% of head-to-head duels, context windows of 200K vs 131K, tested across 49 shared challenges. Updated April 2026.

Which is better, Claude Haiku 4.5 or GPT OSS 120B?

Claude Haiku 4.5 is the better choice overall, winning 86% of 9 blind community votes on Rival. Claude Haiku 4.5 costs $1/M input tokens vs $0.18/M for GPT OSS 120B. Context windows: 200K vs 131K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Haiku 4.5 and GPT OSS 120B

Claude Haiku 4.5 is made by anthropic while GPT OSS 120B is from openai. Claude Haiku 4.5 has a 200K token context window compared to GPT OSS 120B's 131K. On pricing, Claude Haiku 4.5 costs $1/M input tokens vs $0.18/M for GPT OSS 120B. In community voting, In 9 community votes, Claude Haiku 4.5 wins 86% of head-to-head duels.

In 9 community votes, Claude Haiku 4.5 wins 86% of head-to-head duels. Claude Haiku 4.5 leads in Web Design, Reasoning. Based on blind community voting from the Rival open dataset of 9+ human preference judgments for this pair.

Web Design: Claude Haiku 4.5 wins 100% of votes
Reasoning: Claude Haiku 4.5 wins 67% of votes
Our Verdict
Claude Haiku 4.5
Claude Haiku 4.5Winner
GPT OSS 120B
GPT OSS 120BRunner-up

Pick Claude Haiku 4.5. In 9 blind votes, Claude Haiku 4.5 wins 86% of the time. That's not luck.

Claude Haiku 4.5 particularly excels in Web Design, Reasoning. GPT OSS 120B is 6.3x cheaper per token — worth considering if cost matters.

Clear winner
Writing DNA

Style Comparison

Similarity
97%

Claude Haiku 4.5 uses 3.5x more lists

Claude Haiku 4.5
GPT OSS 120B
61%Vocabulary52%
47wSentence Length19w
0.64Hedging0.28
5.1Bold7.4
6.3Lists1.8
0.20Emoji0.15
2.46Headings0.73
0.17Transitions0.17
Based on 24 + 21 text responses
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Claude Haiku 4.5GPT OSS 120B

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