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GPT-5 vs GPT-OSS-20B
Comprehensive side-by-side LLM comparison
GPT-5 leads with 13.0% higher average benchmark score. GPT-5 offers 300.7K more tokens in context window than GPT-OSS-20B. GPT-5 is $Infinity cheaper per million tokens. GPT-5 supports multimodal inputs. Overall, GPT-5 is the stronger choice for coding tasks.
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OpenAI
GPT-5, released by OpenAI on August 7, 2025, is a large language model that combines direct generation and extended reasoning in a single unified system with a built-in routing mechanism. It features a 400K token context window, 128K maximum output tokens, native multimodal support (text, image, audio, video), and demonstrated strong results across coding, mathematics, visual understanding, and health benchmarks at release. GPT-5 targets complex multi-step tasks including advanced coding, mathematical problem solving, and long-context analysis.
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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.
2 days newer
GPT-OSS-20B
OpenAI
2025-08-05
GPT-5
OpenAI
2025-08-07
Pricing Comparison
Cost per million tokens (USD)
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GPT-5
Input:$30.00
Output:$120.00($Infinity cheaper)
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GPT-OSS-20B
Input:$Infinity
Output:$Infinity
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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GPT-5
Average Score:53.7%(+13.0%)
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GPT-OSS-20B
Average Score:40.7%
Performance comparison across key benchmark categories
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GPT-5
Science87.3%(+7.2%)
Agents20.1%(+18.8%)
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GPT-OSS-20B
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Knowledge Cutoff
Training data recency comparison
GPT-5
2025-05
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-5
1 providers
OpenAI
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GPT-OSS-20B
1 providers
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GPT-5
Avg Score:53.7%(+13.0%)
Providers:1
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GPT-OSS-20B
Avg Score:40.7%
Providers:1