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Claude 3.5 Sonnet vs GPT-OSS-20B
Comprehensive side-by-side LLM comparison
GPT-OSS-20B leads with 12.7% higher average benchmark score. Claude 3.5 Sonnet offers 76.0K more tokens in context window than GPT-OSS-20B. Claude 3.5 Sonnet is $Infinity cheaper per million tokens. Claude 3.5 Sonnet supports multimodal inputs. Claude 3.5 Sonnet is available on 3 providers. Overall, GPT-OSS-20B is the stronger choice for coding tasks.
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Anthropic
Claude 3.5 Sonnet, updated by Anthropic in October 2024 (originally released June 2024), is a large language model from the Claude 3.5 family that delivered strong performance in coding, reasoning, and instruction-following at its release. It supports a 200K token context window, 8K maximum output tokens, and native image understanding including screenshot analysis and document comprehension. Claude 3.5 Sonnet targets general-purpose development tasks, document analysis, and applications requiring reliable instruction following with visual input support.
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OpenAI
GPT-OSS-20B is an open-weight large language model with 20 billion parameters from OpenAI's open-source model initiative. It targets deployments requiring a smaller, efficient model that can run on consumer or mid-tier hardware while maintaining strong reasoning and coding capabilities relative to its size.
9 months newer
Claude 3.5 Sonnet
Anthropic
2024-10-22
GPT-OSS-20B
OpenAI
2025-08-05
Pricing Comparison
Cost per million tokens (USD)
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Claude 3.5 Sonnet
Input:$3.00
Output:$15.00($Infinity cheaper)
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GPT-OSS-20B
Input:$Infinity
Output:$Infinity
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude 3.5 Sonnet
Average Score:28.0%
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GPT-OSS-20B
Average Score:40.7%(+12.7%)
Performance comparison across key benchmark categories
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Claude 3.5 Sonnet
Science55.0%
Agents0.9%
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GPT-OSS-20B
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Knowledge Cutoff
Training data recency comparison
Claude 3.5 Sonnet
2024-04
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 3.5 Sonnet
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-OSS-20B
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Claude 3.5 Sonnet
Avg Score:28.0%
Providers:3
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GPT-OSS-20B
Avg Score:40.7%(+12.7%)
Providers:1