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Claude Sonnet 4.5 vs GPT OSS 120B
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 10.8% higher average benchmark score. Claude Sonnet 4.5 offers 1.9K more tokens in context window than GPT OSS 120B. GPT OSS 120B is $17.46 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. GPT OSS 120B is available on 5 providers. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5 was developed to bridge human thinking and machine assistance, allowing people to work with language and tools in a more conversational and natural way. Built with a focus on turning ideas into results, it represents an evolution in making AI feel less mechanical while maintaining strong capabilities across reasoning, coding, and collaborative tasks.
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OpenAI
GPT-OSS 120B was developed as an open-source model release from OpenAI, designed to provide the research and developer community with access to a capable language model. Built with 120 billion parameters, it enables experimentation, fine-tuning, and deployment in contexts where open-source licensing and transparency are valued.
1 month newer
GPT OSS 120B
OpenAI
2025-08-05
Claude Sonnet 4.5
Anthropic
2025-09-29
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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 120B
Input:$0.09
Output:$0.45($17.46 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Sonnet 4.5
Average Score:84.8%(+10.8%)
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GPT OSS 120B
Average Score:74.0%
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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:84.8%(+10.8%)
Providers:2
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GPT OSS 120B
Avg Score:74.0%
Providers:5