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Claude Sonnet 4.5 vs GPT OSS 20B
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 22.6% higher average benchmark score. Claude Sonnet 4.5 offers 1.9K more tokens in context window than GPT OSS 20B. GPT OSS 20B is $17.75 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. GPT OSS 20B is available on 4 providers. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5 is a multimodal language model developed by Anthropic. It achieves strong performance with an average score of 75.8% across 9 benchmarks. It excels particularly in MMMLU (89.1%), AIME 2025 (87.0%), TAU-bench Retail (86.2%). It supports a 264K 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 2025, it represents Anthropic's latest advancement in AI technology.
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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.
1 month newer
GPT OSS 20B
OpenAI
2025-08-05
Claude Sonnet 4.5
Anthropic
2025-09-29
Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00
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GPT OSS 20B
Input:$0.05
Output:$0.20($17.75 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 14 common benchmarks
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Claude Sonnet 4.5
Average Score:48.7%(+22.6%)
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GPT OSS 20B
Average Score:26.1%
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01-31
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Claude Sonnet 4.5
2 providers
Anthropic
Throughput: 42 tok/s
Latency: 0.4ms
ZeroEval
Throughput: 42 tok/s
Latency: 0.4ms
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Claude Sonnet 4.5
Avg Score:48.7%(+22.6%)
Providers:2
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GPT OSS 20B
Avg Score:26.1%
Providers:4