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GPT-5.1 vs GPT-OSS-120B
Comprehensive side-by-side LLM comparison
GPT-5.1 leads with 9.8% higher average benchmark score. GPT-5.1 supports multimodal inputs. Overall, GPT-5.1 is the stronger choice for coding tasks.
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OpenAI
GPT-5.1, released by OpenAI in November 2025, is a large language model from the GPT-5 family that delivers incremental improvements in reasoning, instruction following, and multimodal understanding over GPT-5. It features a 400K token context window and targets general-purpose development, long-context analysis, and agentic workflows.
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OpenAI
GPT-OSS-120B, released by OpenAI in August 2025, is an open-weight large language model with 120 billion parameters distributed under the Apache 2.0 license. It represents OpenAI's entry into the open-source model space, enabling developers to self-host and fine-tune a GPT-5-generation-class model. GPT-OSS-120B targets research applications, on-premises deployments, and custom fine-tuning workflows requiring a large open-weight base model.
3 months newer
GPT-OSS-120B
OpenAI
2025-08
GPT-5.1
OpenAI
2025-11
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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GPT-5.1
Average Score:88.1%(+9.8%)
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GPT-OSS-120B
Average Score:78.3%
Performance comparison across key benchmark categories
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GPT-5.1
Science88.1%(+9.8%)
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GPT-OSS-120B
Science78.3%
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.1
0 providers
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GPT-OSS-120B
1 providers
Hugging Face
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GPT-5.1
Avg Score:88.1%(+9.8%)
Providers:0
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GPT-OSS-120B
Avg Score:78.3%
Providers:1