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GPT-4o vs GPT-OSS-120B
Comprehensive side-by-side LLM comparison
GPT-OSS-120B leads with 22.2% higher average benchmark score. GPT-4o offers 12.3K more tokens in context window than GPT-OSS-120B. GPT-4o is $Infinity cheaper per million tokens. GPT-4o supports multimodal inputs. Overall, GPT-OSS-120B is the stronger choice for coding tasks.
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OpenAI
GPT-4o, released by OpenAI in May 2024, is a multimodal large language model from the GPT-4 family that natively processes text, image, and audio inputs in a single end-to-end model. It features a 128K token context window and demonstrated competitive performance across coding, reasoning, and vision benchmarks at its release. GPT-4o targets general-purpose assistant applications, vision-enabled workflows, and use cases requiring low-latency multimodal understanding.
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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.
1 year newer
GPT-4o
OpenAI
2024-05-13
GPT-OSS-120B
OpenAI
2025-08
Pricing Comparison
Cost per million tokens (USD)
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GPT-4o
Input:$2.50
Output:$10.00($Infinity cheaper)
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GPT-OSS-120B
Input:$Infinity
Output:$Infinity
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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GPT-4o
Average Score:56.1%
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GPT-OSS-120B
Average Score:78.3%(+22.2%)
Performance comparison across key benchmark categories
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GPT-4o
Science56.1%
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GPT-OSS-120B
Science78.3%(+22.2%)
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Knowledge Cutoff
Training data recency comparison
GPT-4o
2024-04
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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GPT-4o
1 providers
OpenAI
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GPT-OSS-120B
1 providers
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GPT-4o
Avg Score:56.1%
Providers:1
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GPT-OSS-120B
Avg Score:78.3%(+22.2%)
Providers:1