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Claude Opus 4vsGPT OSS 20B

Comparing across 25 challenges

2 Models Selected
Comparison Active
Claude Opus 4

Claude Opus 4

anthropicMay 2025
A
Not disclosed
200,000k
xlarge
conversationreasoningcode generation+3
GPT OSS 20B

GPT OSS 20B

openaiAug 2025
B
21B total (3.6B active per forward pass)
131,072k
large
conversationreasoningcode generation+4

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