GPT-5.1 Chat vs GPT OSS 120B
Compare GPT-5.1 Chat and GPT OSS 120B, both from OpenAI, in 2 community votes, gpt-5.1 chat wins 100% of head-to-head duels, context windows of 128K vs 131K, tested across 53 shared challenges. Updated April 2026.
Which is better, GPT-5.1 Chat or GPT OSS 120B?
GPT-5.1 Chat is the better choice overall, winning 100% of 2 blind community votes on Rival. GPT-5.1 Chat costs $1.25/M input tokens vs $0.18/M for GPT OSS 120B. Context windows: 128K vs 131K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.1 Chat and GPT OSS 120B
GPT-5.1 Chat is made by openai while GPT OSS 120B is from openai. GPT-5.1 Chat has a 128K token context window compared to GPT OSS 120B's 131K. On pricing, GPT-5.1 Chat costs $1.25/M input tokens vs $0.18/M for GPT OSS 120B. In community voting, In 2 community votes, GPT-5.1 Chat wins 100% of head-to-head duels.
In 2 community votes, GPT-5.1 Chat wins 100% of head-to-head duels. GPT-5.1 Chat leads in Web Design. Based on blind community voting from the Rival open dataset of 2+ human preference judgments for this pair.
Pick GPT-5.1 Chat. In 2 blind votes, GPT-5.1 Chat wins 100% of the time. That's not luck.
GPT-5.1 Chat particularly excels in Web Design. GPT OSS 120B is 13x cheaper per token — worth considering if cost matters.
Style Comparison
GPT OSS 120B uses 15.4x more emoji
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