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Claude Opus 4.6 vs GPT-OSS-20B
Comprehensive side-by-side LLM comparison
Claude Opus 4.6 leads with 46.9% higher average benchmark score. Claude Opus 4.6 offers 195.9K more tokens in context window than GPT-OSS-20B. Claude Opus 4.6 is $Infinity cheaper per million tokens. Claude Opus 4.6 supports multimodal inputs. Claude Opus 4.6 is available on 3 providers. Overall, Claude Opus 4.6 is the stronger choice for coding tasks.
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Anthropic
Claude Opus 4.6, released by Anthropic in February 2026, is a large language model from the Claude 4 family designed for complex agent orchestration, extended reasoning, and long-form code generation. It features a 200K token context window (extendable to 1M tokens in beta), 128K maximum output tokens, native image understanding, and extended thinking with both standard and adaptive effort modes. Opus 4.6 targets multi-step agentic workflows, parallel tool use, and applications requiring sustained reasoning over large contexts.
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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 Opus 4.6
Anthropic
2026-02
Pricing Comparison
Cost per million tokens (USD)
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Claude Opus 4.6
Input:$5.00
Output:$25.00($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 Opus 4.6
Average Score:87.6%(+46.9%)
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GPT-OSS-20B
Average Score:40.7%
Performance comparison across key benchmark categories
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Claude Opus 4.6
Science91.3%(+11.2%)
Agents84.0%(+82.7%)
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GPT-OSS-20B
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Knowledge Cutoff
Training data recency comparison
Claude Opus 4.6
2025-05
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 Opus 4.6
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-OSS-20B
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Claude Opus 4.6
Avg Score:87.6%(+46.9%)
Providers:3
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GPT-OSS-20B
Avg Score:40.7%
Providers:1