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GPT OSS 20B vs GPT-5 mini
Comprehensive side-by-side LLM comparison
GPT-5 mini leads with 5.1% higher average benchmark score. GPT-5 mini offers 265.9K more tokens in context window than GPT OSS 20B. GPT OSS 20B is $2.00 cheaper per million tokens. GPT-5 mini supports multimodal inputs. GPT OSS 20B is available on 4 providers. Overall, GPT-5 mini is the stronger choice for coding tasks.
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OpenAI
GPT-OSS 20B was created as a smaller open-source variant, designed to balance capability with accessibility for researchers and developers. Built with 20 billion parameters, it provides a more approachable entry point for those seeking to work with open-source language models while benefiting from OpenAI's architectural insights.
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OpenAI
GPT-5 Mini was created as a more accessible version of GPT-5, designed to provide strong capabilities with improved efficiency and lower operational costs. Built to extend GPT-5's advancements to a broader range of applications, it balances advanced performance with practical deployment considerations.
2 days newer
GPT OSS 20B
OpenAI
2025-08-05
GPT-5 mini
OpenAI
2025-08-07
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Pricing Comparison
Cost per million tokens (USD)
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GPT OSS 20B
Input:$0.05
Output:$0.20($2.00 cheaper)
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GPT-5 mini
Input:$0.25
Output:$2.00
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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GPT OSS 20B
Average Score:44.4%
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GPT-5 mini
Average Score:49.5%(+5.1%)
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Knowledge Cutoff
Training data recency comparison
GPT-5 mini
2024-05-30
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 OSS 20B
4 providers
Groq
Throughput: 1000 tok/s
Latency: 0.38ms
Novita
OpenAI
Throughput: 115 tok/s
Latency: 5.2ms
ZeroEval
Throughput: 1000 tok/s
Latency: 0.38ms
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GPT OSS 20B
Avg Score:44.4%
Providers:4
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GPT-5 mini
Avg Score:49.5%(+5.1%)
Providers:2