gpt-oss-20b vs Claude 4.1 Opus
Detailed comparison of capabilities, features, and performance.
Feature
gpt-oss-20b
Claude 4.1 Opus
Model Image
AI Lab
OpenAI
Anthropic
Context Size
128,000 tokens
200,000 tokens
Max Output Size
16,384 tokens
64,000 tokens
Frontier Model
No
Yes
Vision Support
No
Yes
Description
OpenAI's smaller open-weight model for powerful reasoning and agentic tasks.
The latest Opus 4.1 model from Anthropic
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View detailed specifications and capabilities
View model details →Learn more about Claude 4.1 Opus
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