Release dates
— OpenAI released the gpt-oss-120b and gpt-oss-20b weights together. ↗
gpt-oss-20b
The smaller open reasoning tier, with 21B total and 3.6B active parameters per token, targeting local deployment and lower latency.
MODEL NUMBER355
- First public date
- 2025-08-05
- Organization
- OpenAI
- Family
- gpt-oss
01
Specifications
Only published specifications are shown.
02
Overview
03
Architecture & capabilities
Model capabilities
ReasoningCodingTool use
API features
Adjustable reasoning
04
Release history
OpenAI released the gpt-oss-120b and gpt-oss-20b weights together.
View source05
Related models
Select a card to view the related model.
06
Sources
01
Introducing gpt-ossOpenAI · Published 2025-08-05 · Checked 2026-09-06
Official · Verified02gpt-oss-20b official model cardOpenAI · Checked 2026-09-06
Official · Verified03gpt-oss-20b configurationOpenAI · Checked 2026-09-06
Official · Verified04gpt-oss-120b official model cardOpenAI · Checked 2026-09-06
Official · VerifiedSuggest a correction
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