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gpt-oss-20b

OpenAI's smaller open-weights reasoning model (21B MoE, 3.6B active) under Apache 2.0, made for local use.

  • OpenAI
  • Open weights
  • Released 5 Aug 2025

Official page

Where it ranks

  • C
    Chat & assistants
    Models · Local · 1,317 on LMArena Text Arena (overall, style control)
  • C
    Writing
    Models · Local · 1,240 on LMArena Text Arena: Creative Writing (style control)
  • C
    Coding
    Models · Local · 9 on Artificial Analysis Intelligence Index (secondary benchmark)

Facts

Vendor
OpenAI
Family
gpt-oss (small)
Released
5 Aug 2025
Weights
Open: download and run it yourself
License
Apache-2.0
Parameters
21B (3.6B active)
GPU memory to run locally
~16 GB (OpenAI model card: runs within 16 GB of memory with native MXFP4 MoE weights.)
API price
$0.07 in / $0.3 out per 1M tokens
Access
Free (open weights)
Last verified
18 Oct 2026

Price from openrouter.ai, 18 Oct 2026.

Benchmark results

BenchmarkResultEntry on the leaderboardAs ofSource
Artificial Analysis Intelligence Index9gpt-oss-20b (High)
Raw value from the page's embedded model data; the site displays it rounded to an integer. Higher '(Low)' value 9.95 is flagged as estimated by AA, so the non-estimated entry is used.
18 Oct 2026artificialanalysis.ai
EQ-Bench Creative Writing v3666openai/gpt-oss-20b
Elo score from the leaderboard data embedded in https://eqbench.com/creative_writing.js (file last modified 2026-09-24); rank 137 of 140; rubric score 7.87.
24 Sep 2026eqbench.com
LMArena Text Arena (overall, style control)1,317gpt-oss-20b
From LMArena's official leaderboard-dataset (text_style_control, split latest, category overall, published 2026-10-15), which mirrors https://arena.ai/leaderboard/text (site blocks automated fetches).
15 Oct 2026huggingface.co
LMArena Text Arena: Creative Writing (style control)1,240gpt-oss-20b
From LMArena's official leaderboard-dataset (text_style_control, split latest, category creative_writing, published 2026-10-15), which mirrors https://arena.ai/leaderboard/text/creative-writing (site blocks automated fetches). Rank 304 of 414; 1234 votes; 95% CI 1222.1-1258.8.
15 Oct 2026huggingface.co

Where you can use it

Sources