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GPT OSS 20B vs GPT-4o
Comprehensive side-by-side LLM comparison
GPT OSS 20B leads with 1.9% higher average benchmark score. GPT OSS 20B offers 117.8K more tokens in context window than GPT-4o. GPT OSS 20B is $12.25 cheaper per million tokens. GPT-4o supports multimodal inputs. GPT OSS 20B is available on 4 providers. Both models have their strengths depending on your specific coding needs.
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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
This updated version of GPT-4o was released with refinements to its multimodal capabilities and improved performance across text, vision, and audio tasks. Built to incorporate learnings from the initial GPT-4o deployment, it enhanced reliability and accuracy while maintaining the seamless cross-modal reasoning that defines the GPT-4o family.
12 months newer
GPT-4o
OpenAI
2024-08-06
GPT OSS 20B
OpenAI
2025-08-05
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Pricing Comparison
Cost per million tokens (USD)
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GPT OSS 20B
Input:$0.05
Output:$0.20($12.25 cheaper)
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GPT-4o
Input:$2.50
Output:$10.00
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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GPT OSS 20B
Average Score:57.2%(+1.9%)
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GPT-4o
Average Score:55.4%
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:57.2%(+1.9%)
Providers:4
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GPT-4o
Avg Score:55.4%
Providers:2