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Claude Opus 4.1 vs GPT OSS 20B
Comprehensive side-by-side LLM comparison
Claude Opus 4.1 leads with 18.5% higher average benchmark score. GPT OSS 20B offers 30.1K more tokens in context window than Claude Opus 4.1. GPT OSS 20B is $89.75 cheaper per million tokens. Claude Opus 4.1 supports multimodal inputs. Overall, Claude Opus 4.1 is the stronger choice for coding tasks.
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Anthropic
Claude Opus 4.1 represents an iteration within the Claude 4 Opus line, built to deliver refined performance in complex reasoning and analysis tasks. Developed as part of Anthropic's flagship tier, it incorporates improvements to the foundational capabilities that define the Opus family of models.
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OpenAI
GPT-OSS 20B was created as a smaller open-source variant, designed to balance capability with accessibility for researchers and developers. Built with 20 billion parameters, it provides a more approachable entry point for those seeking to work with open-source language models while benefiting from OpenAI's architectural insights.
Launched on the same date
Claude Opus 4.1
Anthropic
2025-08-05
GPT OSS 20B
OpenAI
2025-08-05
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Pricing Comparison
Cost per million tokens (USD)
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Claude Opus 4.1
Input:$15.00
Output:$75.00
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GPT OSS 20B
Input:$0.05
Output:$0.20($89.75 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Opus 4.1
Average Score:81.7%(+18.5%)
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GPT OSS 20B
Average Score:63.1%
Provider Availability & Performance
Available providers and their performance metrics
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Claude Opus 4.1
4 providers
Anthropic
Throughput: 100 tok/s
Latency: 0.5ms
Bedrock
Throughput: 120 tok/s
Latency: 0.5ms
Throughput: 42 tok/s
Latency: 0.4ms
ZeroEval
Throughput: 42 tok/s
Latency: 0.4ms
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Claude Opus 4.1
Avg Score:81.7%(+18.5%)
Providers:4
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GPT OSS 20B
Avg Score:63.1%
Providers:4