gpt-oss-20b vs Gemini 2.5 Pro

Detailed comparison of capabilities, features, and performance.

Feature
gpt-oss-20b
Gemini 2.5 Pro
Model Image
gpt-oss-20b
Gemini 2.5 Pro
AI Lab
OpenAI
Google
Context Size
128,000 tokens
1,048,756 tokens
Max Output Size
16,384 tokens
65,535 tokens
Frontier Model
No
Yes
Vision Support
No
Yes
Description
OpenAI's smaller open-weight model for powerful reasoning and agentic tasks.
A powerful reasoning model for problem-solving tasks and multimodal capabilities.

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