gpt-oss-120b
An open reasoning model with 117B total and 5.1B active parameters per token, for customization and tool workflows.
FAMILY / OPENAI
gpt-oss
OpenAI’s 2025 open-weight reasoning branch, with two MoE models for different deployment sizes.
- First model
- 2025
- Models
- 2
- Latest dated version
- gpt-oss-20b
01 / LINEAGE MAP
Family release sequence
Relationship branches
Product predecessors do not imply inherited weights; technical lineage needs explicit official evidence.
All relationships · 1
- gpt-oss-20bSiblinggpt-oss-120bOfficial relationship evidence · productIntroducing gpt-oss ↗
02 / GENERATIONS
What changed
gpt-oss-20b
The smaller open reasoning tier, with 21B total and 3.6B active parameters per token, targeting local deployment and lower latency.