Model family timeline
Last updated Aug 5, 2025
gpt-oss model releases
A source-backed timeline for the gpt-oss model family, collecting release dates, labs, access details, context windows, and major lifecycle changes.
2
Models
1
Labs
2
Open
2
Recent
Most recent in this set
2 models
gpt-oss-20b
AvailableOpenAIOpen source
Smaller gpt-oss reasoning model optimized for local inference on systems with about 16GB of memory.
Type
MoE
Params
21B
Context
128K
Top eval
—
Released
Aug 5, 2025
11mo ago
MoE21B128K ctxAug 5, 2025
gpt-oss-120b
AvailableOpenAIOpen source
OpenAI's larger open-weight reasoning model, a 117B-total / 5.1B-active MoE with 128K context for local and self-hosted deployment.
Type
MoE
Params
117B
Context
128K
Top eval
—
Released
Aug 5, 2025
11mo ago
MoE117B128K ctxAug 5, 2025