Model family

gpt-oss

gpt-oss is a model family from OpenAI1 2, with 2 assessed releases in this catalog. Licenses and availability are recorded for each release, not for the family; its releases use the Apache License 2.0.

gpt-oss is OpenAI's series of open-weight, text-only reasoning models, released in August 2025 in two sizes: gpt-oss-120b and gpt-oss-20b. Both are mixture-of-experts transformers trained for OpenAI's harmony response format. OpenAI later published gpt-oss-safeguard models fine-tuned from them for safety classification.1 2 5

Repository: gpt-oss repository (external site: github.com)
Model hub: gpt-oss-120b on Hugging Face (external site: huggingface.co)
Model hub: gpt-oss-20b on Hugging Face (external site: huggingface.co)
Paper: gpt-oss-120b & gpt-oss-20b Model Card (arXiv) (external site: arxiv.org)

On AI on Hugging Face: openai/gpt-oss-120b, openai/gpt-oss-20b

Last reviewedSep 29, 2026Entry updated Sep 29, 2026Documented release Aug 2025

Releases assessed

Each release is assessed on its own. This family has no family-wide openness label.

Releases in the gpt-oss family
Release	Weights	Tier (USASI rubric v0.2)	License	Released
gpt-oss-120b	Weights: Public	Model-disclosure tier (USASI rubric v0.2): Open-weight	Apache-2.0, Apache-2.0	Aug 2025
gpt-oss-20b	Weights: Public	Model-disclosure tier (USASI rubric v0.2): Open-weight	Apache-2.0, Apache-2.0	Aug 2025

What it is useful for

The model card describes use in agentic workflows with instruction following, tool use such as web search and Python execution, adjustable reasoning effort, and structured outputs.1

Organization context

OpenAI

Provenance and derivatives

Catalog records that name this entry in their provenance:

gpt-oss-safeguard

U.S. eligibility

Project eligibility rests on documented governing or maintaining entities, not on contributors.

Eligible · basis: U.S. headquarters

Developed and published by OpenAI. Its operating company, OpenAI Group PBC, lists its address in San Francisco, California, in a February 2026 SEC-filed agreement.1 6

Assessed Sep 29, 2026

Sources

1.
gpt-oss-120b & gpt-oss-20b Model Card (external site: cdn.openai.com)
OpenAI · Model card · published Aug 5, 2025 · accessed Sep 29, 2026
2.
openai/gpt-oss (GitHub repository) (external site: github.com)
OpenAI · Repository · accessed Sep 29, 2026
3.
openai/gpt-oss-120b (external site: huggingface.co)
OpenAI (Hugging Face) · Model card · accessed Sep 29, 2026
4.
openai/gpt-oss-20b (external site: huggingface.co)
OpenAI (Hugging Face) · Model card · accessed Sep 29, 2026
5.
openai/gpt-oss-safeguard-120b (external site: huggingface.co)
OpenAI (Hugging Face) · Model card · accessed Sep 29, 2026
6.
Exhibit 10.1: Equity commitment letter agreement between OpenAI Group PBC and Amazon (external site: sec.gov)
U.S. Securities and Exchange Commission (Amazon.com, Inc. filing) · Filing · published Feb 27, 2026 · accessed Sep 29, 2026

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This listing is not an endorsement, a safety assessment, or a federal approval.

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APA style

USASI. (2026, September 29). gpt-oss. United States of America Superintelligence. https://unitedstatesofamericasuperintelligence.com/open/gpt-oss/

BibTeX

@misc{usasi_gpt_oss,
  author = {{USASI}},
  title = {gpt-oss},
  year = {2026},
  month = sep,
  howpublished = {\url{https://unitedstatesofamericasuperintelligence.com/open/gpt-oss/}},
  note = {United States of America Superintelligence. Last updated 2026-09-29}
}

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