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GPT OSS 20B vs GPT-4o
Comprehensive side-by-side LLM comparison
GPT-4o leads with 40.3% 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. Overall, GPT-4o is the stronger choice for coding tasks.
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OpenAI
GPT OSS 20B is a language model developed by OpenAI. The model shows competitive results across 7 benchmarks. It excels particularly in MMLU (85.3%), CodeForces (83.9%), GPQA (71.5%). It supports a 262K token context window for handling large documents. The model is available through 4 API providers. It's licensed for commercial use, making it suitable for enterprise applications. Released in 2025, it represents OpenAI's latest advancement in AI technology.
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OpenAI
GPT-4o is a multimodal language model developed by OpenAI. The model shows competitive results across 39 benchmarks. It excels particularly in AI2D (94.2%), DocVQA (92.8%), ChartQA (85.7%). It supports a 144K token context window for handling large documents. The model is available through 2 API providers. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2024, it represents OpenAI's latest advancement in AI technology.
12 months newer
GPT-4o
OpenAI
2024-08-06
GPT OSS 20B
OpenAI
2025-08-05
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 42 common benchmarks
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GPT OSS 20B
Average Score:8.7%
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GPT-4o
Average Score:49.0%(+40.3%)
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:8.7%
Providers:4
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GPT-4o
Avg Score:49.0%(+40.3%)
Providers:2