# gpt-oss-20b

[Canonical model page](https://headlessthrones.com/models/gpt-oss-20b) · [Model library](https://headlessthrones.com/models)

Public catalog reference from Headless Thrones. Exact catalog ID: `gpt-oss-20b`. Catalog source-check date: 2026-10-23.

This brief contains the public catalog answers and any catalog guide, not private drafts, historical editorial revisions or independently measured rankings. The canonical HTML page may also display separately published editorial.

Current catalog answers

## What to know about gpt-oss-20b

AI-compiled from linked model documentation. This is a catalog reference, not an independent performance review. Catalog checked October 23, 2026.

[Access](https://headlessthrones.com/models/gpt-oss-20b#model-answer-access) · [Exact model](https://headlessthrones.com/models/gpt-oss-20b#model-answer-identity) · [Token limits](https://headlessthrones.com/models/gpt-oss-20b#model-answer-context) · [Dates & knowledge](https://headlessthrones.com/models/gpt-oss-20b#model-answer-dates) · [Inputs & outputs](https://headlessthrones.com/models/gpt-oss-20b#model-answer-modalities) · [License](https://headlessthrones.com/models/gpt-oss-20b#model-answer-license)

### How can you access gpt-oss-20b?

The catalog documents **Open weights** access  for gpt-oss-20b. [Source](https://developers.openai.com/api/docs/models/gpt-oss-20b)

As of the catalog check, this version was listed as available. [Source](https://developers.openai.com/api/docs/models/gpt-oss-20b)

Open weights means the model weights are distributed for use under their stated terms. It does not establish a hosted API, an open-source license, or a hardware requirement.

### Which gpt-oss-20b does this page describe?

gpt-oss-20b is a model record from **OpenAI** in the GPT-OSS family. [Source](https://developers.openai.com/api/docs/models/gpt-oss-20b)

The recorded model identifier or checkpoint is `gpt-oss-20b`. Use that exact identifier when checking documentation or a provider listing. [Source](https://developers.openai.com/api/docs/models/gpt-oss-20b)

### What are gpt-oss-20b's context and output limits?

The documented **context window is 131,072 tokens**. [Source](https://developers.openai.com/api/docs/models/gpt-oss-20b)

The documented **maximum output is 131,072 tokens**. [Source](https://developers.openai.com/api/docs/models/gpt-oss-20b)

Context, input and output limits describe different constraints. Do not add the figures together to infer a larger window. Check the endpoint's accounting for conversation history, system instructions, tools, media and generated tokens; a documented maximum is not a guarantee of answer quality or a measured usable capacity.

### What dates are documented for gpt-oss-20b?

**Knowledge cutoff: June 1, 2024.** [Source](https://developers.openai.com/api/docs/models/gpt-oss-20b) This labels the documented knowledge boundary; it is not a promise that every earlier fact is known or correct.

Retrieval or web tools can supply newer information at run time. That does not change the model's recorded training or knowledge dates, and this record does not establish that a particular endpoint includes those tools.

### What can gpt-oss-20b receive and generate?

Documented inputs: **text**. [Source](https://developers.openai.com/api/docs/models/gpt-oss-20b)

Documented outputs: **text**. [Source](https://developers.openai.com/api/docs/models/gpt-oss-20b)

Input support and output generation are separate capabilities. Reading an image does not establish image generation; a text output listing does not establish speech output. File sizes, formats and media limits depend on the documented implementation.

### What license is recorded for gpt-oss-20b?

The recorded license label is **Apache-2.0**. [Source](https://developers.openai.com/api/docs/models/gpt-oss-20b)

Read the linked license and associated use terms for this exact version before redistribution, commercial deployment or fine-tuning. A label alone does not establish every permission, restriction or obligation, and it does not determine the terms of a separate hosted service.

**Evidence still missing here:** tested hardware requirements. Missing documentation is not evidence that a feature is unavailable.

Headless Thrones has not independently benchmarked this model for this reference. Evaluate it on representative work before choosing it; these facts do not rank its accuracy, reliability, speed or suitability against another model.

Keep the exact version in view

## Other GPT-OSS models from OpenAI.

These are separate records in the same publisher family. A shared family name does not establish equal capabilities or interchangeable licenses.

### [gpt-oss-120b](https://headlessthrones.com/models/gpt-oss-120b)

Open weights · 131,072 context tokens