Artificial intelligence · August 2025

gpt-oss open-weight models

OpenAI's first open-weight language models since GPT-2.

OpenAI released gpt-oss-120b (117B parameters) and gpt-oss-20b (21B) under Apache 2.0, with reasoning performance comparable to o4-mini and o3-mini. The smaller model runs in 16 GB of memory, which put an o3-mini-class reasoner on a laptop.

See it in the living tree Wikipedia Source

Arcs above join it to what it stood on, arcs below to what it led to. The bar places this stretch on the tree's whole timeline.

What it built on 2

o3 and ARC-AGI 2024
Mixture of experts 1991

Related measurements

The dashed line marks when it first worked.

Best AI score on GPQA Diamond Latest: 95.8 % correct (2026) Source: Epoch AI, Capabilities & benchmarking (benchmark_data.zip, gpqa_diamond.csv); Anthropic: Claude 3 public launch (March 4, 2024)

Training compute of notable AI models Source: Epoch AI, Notable AI Models (CC BY 4.0)