gpt-oss-20b vs Claude 4 Opus

Detailed comparison of capabilities, features, and performance.

Feature
gpt-oss-20b
Claude 4 Opus
Model Image
gpt-oss-20b
Claude 4 Opus
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 model from Anthropic

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