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GPT-OSS-20B vs o3
Comprehensive side-by-side LLM comparison
GPT-OSS-20B leads with 11.0% higher average benchmark score. o3 offers 167.9K more tokens in context window than GPT-OSS-20B. o3 is $Infinity cheaper per million tokens. o3 supports multimodal inputs. Overall, GPT-OSS-20B is the stronger choice for coding tasks.
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OpenAI
GPT-OSS-20B is an open-weight large language model with 20 billion parameters from OpenAI's open-source model initiative. It targets deployments requiring a smaller, efficient model that can run on consumer or mid-tier hardware while maintaining strong reasoning and coding capabilities relative to its size.
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OpenAI
OpenAI o3, released by OpenAI in April 2025, is a large reasoning model that applies extended chain-of-thought processing to deliver improved performance on complex math, science, and coding tasks. It features a 200K token context window and native image understanding, with demonstrated strong results on mathematics and software engineering benchmarks. o3 targets demanding analytical and engineering tasks where deliberate, multi-step reasoning produces significantly better outcomes than direct generation.
3 months newer
o3
OpenAI
2025-04-16
GPT-OSS-20B
OpenAI
2025-08-05
Pricing Comparison
Cost per million tokens (USD)
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GPT-OSS-20B
Input:$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-20B
Average Score:80.1%(+11.0%)
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o3
Average Score:69.1%
Performance comparison across key benchmark categories
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GPT-OSS-20B
Science80.1%(+11.0%)
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o3
Science69.1%
Provider Availability & Performance
Available providers and their performance metrics
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GPT-OSS-20B
1 providers
Hugging Face
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o3
1 providers
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GPT-OSS-20B
Avg Score:80.1%(+11.0%)
Providers:1
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o3
Avg Score:69.1%
Providers:1