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OpenAI

Is gpt-oss-20b out? Yes, since August 5, 2025

Yes. gpt-oss-20b was released on August 5, 2025.

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Have you used it? gpt-oss-20b

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Lab
OpenAI
Family
GPT
Release date
Source
OpenAI · gpt-oss

What changed

  • context -87 % · Context window compared with GPT-4.1, same tier in this family. Went from 1.05M tokens to 131k tokens.
  • price -98 % · Prompt price compared with GPT-4.1, same tier in this family. Went from $2.00 / MTok to $0.030 / MTok. Lower is better.

About gpt-oss-20b

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...

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Questions

When was gpt-oss-20b released?
gpt-oss-20b was released on August 5, 2025.
Who makes gpt-oss-20b?
gpt-oss-20b is made by OpenAI.
What comes after gpt-oss-20b?
gpt-oss-120b, released on August 5, 2025.