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Claude Opus 4.1 vs GPT-OSS-20B
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. Claude Opus 4.1 offers 99.9K more tokens in context window than GPT-OSS-20B. Claude Opus 4.1 is $Infinity cheaper per million tokens. Claude Opus 4.1 supports multimodal inputs. Claude Opus 4.1 is available on 3 providers. Both models have their strengths depending on your specific coding needs.
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Anthropic
Claude Opus 4.1, released by Anthropic in August 2025, is a large language model from the Claude 4 family optimized for demanding reasoning, multi-step coding, and extended analysis tasks. It features a 200K token context window, 32K maximum output tokens, native image understanding, and extended thinking capabilities. Opus 4.1 targets complex problem-solving, multi-turn reasoning workflows, and applications requiring deep analysis with integrated tool use.
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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.
Launched on the same date
Claude Opus 4.1
Anthropic
2025-08-05
GPT-OSS-20B
OpenAI
2025-08-05
Pricing Comparison
Cost per million tokens (USD)
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Claude Opus 4.1
Input:$15.00
Output:$75.00($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 4.1
Average Score:40.9%(+0.2%)
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GPT-OSS-20B
Average Score:40.7%
Performance comparison across key benchmark categories
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Claude Opus 4.1
Science80.9%(+0.8%)
Agents0.9%
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GPT-OSS-20B
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Knowledge Cutoff
Training data recency comparison
Claude Opus 4.1
2025-01
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 4.1
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-OSS-20B
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Claude Opus 4.1
Avg Score:40.9%(+0.2%)
Providers:3
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GPT-OSS-20B
Avg Score:40.7%
Providers:1