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GPT-OSS-120B vs o3
Comprehensive side-by-side LLM comparison
GPT-OSS-120B leads with 9.2% higher average benchmark score. o3 offers 167.9K more tokens in context window than GPT-OSS-120B. o3 is $Infinity cheaper per million tokens. o3 supports multimodal inputs. Overall, GPT-OSS-120B is the stronger choice for coding tasks.
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OpenAI
GPT-OSS-120B, released by OpenAI in August 2025, is an open-weight large language model with 120 billion parameters distributed under the Apache 2.0 license. It represents OpenAI's entry into the open-source model space, enabling developers to self-host and fine-tune a GPT-5-generation-class model. GPT-OSS-120B targets research applications, on-premises deployments, and custom fine-tuning workflows requiring a large open-weight base model.
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OpenAI
OpenAI o3, released by OpenAI in April 2025, is a large reasoning model that applies extended chain-of-thought processing to deliver improved performance on complex math, science, and coding tasks. It features a 200K token context window and native image understanding, with demonstrated strong results on mathematics and software engineering benchmarks. o3 targets demanding analytical and engineering tasks where deliberate, multi-step reasoning produces significantly better outcomes than direct generation.
3 months newer
o3
OpenAI
2025-04-16
GPT-OSS-120B
OpenAI
2025-08
Pricing Comparison
Cost per million tokens (USD)
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GPT-OSS-120B
Input:$Infinity
Output:$Infinity
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o3
Input:$10.00
Output:$40.00($Infinity cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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GPT-OSS-120B
Average Score:78.3%(+9.2%)
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o3
Average Score:69.1%
Performance comparison across key benchmark categories
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GPT-OSS-120B
Science78.3%(+9.2%)
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o3
Science69.1%
Provider Availability & Performance
Available providers and their performance metrics
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GPT-OSS-120B
1 providers
Hugging Face
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o3
1 providers
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GPT-OSS-120B
Avg Score:78.3%(+9.2%)
Providers:1
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o3
Avg Score:69.1%
Providers:1