gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for...
Developer
OpenAI
Release Date
August 5, 2025
Context Window
131,072 tokens≈ 175 words
API Access
Publicly AvailableIntegrate via official API
Input Cost
$0.03per million tokens
Output Cost
$0.14per million tokens
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