What changed
OpenAI released gpt-oss-120b and gpt-oss-20b under Apache 2.0, with reasoning controls, tool use, and model weights intended for local or private deployment.
Why it matters
A leading closed-model provider re-entered the downloadable-weight market, giving enterprises a supported option for privacy, offline use, customization, and provider fallback.
What to do
Use gpt-oss-20b for local classification and bounded agents on modest hardware; test gpt-oss-120b for private reasoning workloads before assuming it can replace a hosted frontier model.
Caveat
Open weights shift safety, serving, patching, monitoring, and evaluation obligations to the operator. OpenAI's benchmark comparisons were first-party results.