gpt-oss
AI Model
Language
Current
OpenAI's return to open weights after six years.
You're looking at an AI model record: who built it, what it can do, and the hardware and data behind it.
gpt-oss-120b and 20b (August 2025, Apache 2.0) were OpenAI's first open-weights language models since GPT-2 — MoE reasoning models sized to run on a single H100 or a laptop respectively, released amid competitive pressure from Chinese open models and DeepSeek's example.
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Record reviewed as of 2026-01-15 — see Methodology.