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gpt-oss-20b (free)

by OpenAI

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 f

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Models

gpt-oss-20b (free)

Added 10 July 2026

#openai

Overview

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...

How to use / API access

Call via OpenRouter with model id `openai/gpt-oss-20b:free`.

  • openrouter · openai/gpt-oss-20b:free Docs

OpenRouter id: openai/gpt-oss-20b:free

Benchmarks

  • Intelligence Index (artificial-analysis) : 14.9 index
  • Coding Index (artificial-analysis) : 20.7 index
  • Agentic Index (artificial-analysis) : 3.1 index
  • Design Arena dataviz (other) : 975 elo · #94
  • Design Arena website (other) : 889 elo · #109

Notes

gpt-oss-20b (free) is listed in the EDNA Models directory from the OpenRouter catalogue.

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