Sources & verification notes

gpt-oss-20b

• Exact identifier & access

  Identity and lifecycle apply to this exact identifier and serving surface.

  • All models ↗OpenAI · provider-authored · checked Sep 23, 2026

• First availability

  Effective Aug 5, 2025. Checked Sep 23, 2026.

  Open-weight release date per the launch post (weights on Hugging Face).

  • Introducing gpt-oss ↗OpenAI · provider-authored · checked Sep 23, 2026

• Availability status

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  Available as downloadable open weights; this does not assert an OpenAI API endpoint.

  • All models ↗OpenAI · provider-authored · checked Sep 23, 2026

• Capabilities & limits

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  Image input is unsupported: the model page lists text as the only input modality.

  • gpt-oss-20b Model ↗OpenAI · provider-authored · checked Sep 23, 2026
  • openai/gpt-oss-20b model card ↗OpenAI · provider-authored · checked Sep 23, 2026

• Input price

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  Open weights: self-hosting has no provider token price, and OpenAI's model page lists none.

  • openai/gpt-oss-20b model card ↗OpenAI · provider-authored · checked Sep 23, 2026
  • gpt-oss-20b Model ↗OpenAI · provider-authored · checked Sep 23, 2026

• Output price

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  Open weights: self-hosting has no provider token price, and OpenAI's model page lists none.

  • openai/gpt-oss-20b model card ↗OpenAI · provider-authored · checked Sep 23, 2026
  • gpt-oss-20b Model ↗OpenAI · provider-authored · checked Sep 23, 2026

• Model card

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  • gpt-oss-20b Model ↗OpenAI · provider-authored · checked Sep 23, 2026
  • Introducing gpt-oss ↗OpenAI · provider-authored · checked Sep 23, 2026
  • openai/gpt-oss-20b model card ↗OpenAI · provider-authored · checked Sep 23, 2026

• Official announcement

  Effective Aug 5, 2025. Checked Sep 23, 2026.

  • Introducing gpt-oss ↗OpenAI · provider-authored · checked Sep 23, 2026

• License

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  • All models ↗OpenAI · provider-authored · checked Sep 23, 2026