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Claude Sonnet 4.6 vs GPT-OSS-20B
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.6 leads with 41.6% higher average benchmark score. Claude Sonnet 4.6 offers 131.9K more tokens in context window than GPT-OSS-20B. Claude Sonnet 4.6 is $Infinity cheaper per million tokens. Claude Sonnet 4.6 supports multimodal inputs. Claude Sonnet 4.6 is available on 3 providers. Overall, Claude Sonnet 4.6 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.6 is a general-purpose language model from Anthropic, released in February 2026 as an update to the Sonnet 4 line that introduced adaptive thinking — a mode where the model automatically calibrates its reasoning depth based on task complexity rather than requiring manual configuration by the developer. The model accepts text and image inputs and integrates natively with web search and code execution tools, consolidating capabilities that previously required separate toolchain setup into a unified API surface. It became the primary workhorse model in the Claude 4 series for code assistance, agentic pipelines, and retrieval-augmented applications that benefit from built-in web access.
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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.
6 months newer
GPT-OSS-20B
OpenAI
2025-08-05
Claude Sonnet 4.6
Anthropic
2026-02-17
Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4.6
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 Sonnet 4.6
Average Score:82.3%(+41.6%)
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GPT-OSS-20B
Average Score:40.7%
Performance comparison across key benchmark categories
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Claude Sonnet 4.6
Science89.9%(+9.8%)
Agents74.7%(+73.4%)
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GPT-OSS-20B
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.6
2025-08
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 4.6
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-OSS-20B
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Claude Sonnet 4.6
Avg Score:82.3%(+41.6%)
Providers:3
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GPT-OSS-20B
Avg Score:40.7%
Providers:1