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GPT OSS 20B vs GPT-4.5
Comprehensive side-by-side LLM comparison
GPT-4.5 leads with 43.2% higher average benchmark score. GPT OSS 20B offers 130.0K more tokens in context window than GPT-4.5. GPT OSS 20B is $224.75 cheaper per million tokens. GPT-4.5 supports multimodal inputs. GPT OSS 20B is available on 4 providers. Overall, GPT-4.5 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-4.5 is a multimodal language model developed by OpenAI. It achieves strong performance with an average score of 63.1% across 27 benchmarks. It excels particularly in GSM8k (97.0%), MMLU (90.8%), CharXiv-D (90.0%). It supports a 132K token context window for handling large documents. The model is available through 1 API provider. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents OpenAI's latest advancement in AI technology.
5 months newer
GPT-4.5
OpenAI
2025-02-27
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($224.75 cheaper)
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GPT-4.5
Input:$75.00
Output:$150.00
Performance Metrics
Context window and performance specifications
Average performance across 31 common benchmarks
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GPT OSS 20B
Average Score:11.8%
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GPT-4.5
Average Score:55.0%(+43.2%)
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:11.8%
Providers:4
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GPT-4.5
Avg Score:55.0%(+43.2%)
Providers:1