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Claude 3.5 Sonnet vs GPT OSS 120B
Comprehensive side-by-side LLM comparison
GPT OSS 120B leads with 3.7% higher average benchmark score. Claude 3.5 Sonnet offers 137.9K more tokens in context window than GPT OSS 120B. GPT OSS 120B is $17.46 cheaper per million tokens. Claude 3.5 Sonnet supports multimodal inputs. GPT OSS 120B is available on 5 providers. Both models have their strengths depending on your specific coding needs.
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Anthropic
This upgraded version of Claude 3.5 Sonnet was released with significant improvements in coding and agentic tool use. Built to deliver enhanced performance in software engineering tasks, it brought substantial gains in reasoning and problem-solving while introducing the groundbreaking computer use capability in public beta, allowing it to interact with computer interfaces like a human.
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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.
9 months newer
Claude 3.5 Sonnet
Anthropic
2024-10-22
GPT OSS 120B
OpenAI
2025-08-05
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Pricing Comparison
Cost per million tokens (USD)
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Claude 3.5 Sonnet
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 3 common benchmarks
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Claude 3.5 Sonnet
Average Score:75.6%
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GPT OSS 120B
Average Score:79.3%(+3.7%)
Provider Availability & Performance
Available providers and their performance metrics
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Claude 3.5 Sonnet
3 providers
Anthropic
Throughput: 100 tok/s
Latency: 0.5ms
Bedrock
Throughput: 101 tok/s
Latency: 0.5ms
Throughput: 42 tok/s
Latency: 0.4ms
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Claude 3.5 Sonnet
Avg Score:75.6%
Providers:3
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GPT OSS 120B
Avg Score:79.3%(+3.7%)
Providers:5