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...
Specifications
- Provider
- OpenAI
- Type
- Open-source / open-weight
- Modality
- text->text
- Context window
- 131,072
- Knowledge cutoff
- 2024-06-30
- Released
- August 5, 2025
Capabilities
Input: textOutput: textReasoning requiredConfigurable reasoning effort
Strengths
frequency_penaltyinclude_reasoninglogprobsmax_tokenspresence_penaltyreasoningreasoning_effortrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_ktop_logprobstop_p
